i just had a debate project in gov class about violence in video games, and i raped the other team so bad they'll never get the cum-stains of shame washed off. i know how to handle your mom (BOW CHICKA BOW WOW)
Before i say anything, i just wanna say that considering she's a single mother, she loves you very much and i can see she's trying her best to be a mother. your mom is an example of the kind of parents i was asking for in my speech actually because some parents give their kids games they've been asking for like GTA4 or Gears of War 2 and then they blame the game developer for 'turning their child into a violent person'. you mom is doing exactly what i wanted parents to do in my speech. look at the ratings before you let your child play the game!!!
first, showing your mom what MW2 was about was possibly the WORST idea EVER. when you get shot, there's no health bar, your screen just gets covered in blood, pretty graphic. there's also a dozen levels in the game where in Washington D.C. and that may seem very fiction, but the game's graphic's are AMAZING, so it creates an extremely real view of war on the american homefront (SPOILER ALERT: IT WAS RUSSIA!). watching the white house burn while snipers pick off your nuts one at a time isn't the prettiest sight. someone also drops the f-bomb late in the game, and there are subtitles, so good luck dodging that one.
but that's not the worst part, there's a level in the game that is so contreverstial, it will be talked about and remembered for all of time. SPOILER ALERT: in the game, you (aka pvt. allen park) become an undercover CIA agent who start's working for a mercenary and the game's main villan, Makorov, so intel can learn more about him. shockingly enough, while your working for makorov he has an assignment that involves walking into a russian airport and opening fire on at least a hundred unarmed civilians with fully automatic heavy machine guns. a few of them have 9 mm handguns, but they're airport security, and you have light body armor. the level is called NO RUSSIAN, and you're as smart as you say you are, you can easily see why. HOWEVER, because this clearly might offend russians and unarmed civilians, the game asks you if you want to skip that mission due to content twice; once before the game starts and again right before you play that level.
now about solving your gaming crisis, i'd advise looking at games with unrealistic violence, like ratchet and clank, that's a classic right there. you could go buy call of duty classic, it may be 1944 and not 2010, but it's rated T and your not shooting civilians, your shooting nazis, your mom should be ok with it as long as she's not a nazi sympathizer, which i doubt she is (and i pray she isn't, or else a huge majority of games will be out of your reach).
if your mom has a question about content and you know she's not gonna like the answer, make up something, like "that's not blood, they're robots fueled by fruit punch"(GoW2) that was a pretty stupid lie, but you get the idea.
Halo 3 and ODST are good choices. you're shooting aliens for god's sake, and you're using weapons of the future, not always bullets either. when you see a dead brute or grunt covered in their glowing blue blood, you won't vomit and ask yourself "what have i done?", you'll rejoice with your fellow human companions in glory that you've saved earth one battle at a time.
the whole game plays pretty unrealisticly. you look like a motorcross/paintball god and you can jump 10 feet in the air. in ODST however, you're not a god, but you can see in the dark better than a bat does, and when you do, everything looks 3x more unrealistic. did i mention that in both games you're 3x bigger than normal cars?
if you're feeling brave, you can try brutal legend, it's rated M (FOR A VERY GOOD REASON) but if you do ask, tell your mom that the game allows the player to self filter game content. in the opening cutscene, it actually stops twice and ask you about censoring language and blood in a very humorous way. like for cursing the two options are "please censor it!" or "ok, but only when it's funny" and for the part about blood it say "no blood please!" or "I WANNA SEE EVERY BIT OF IT!". it's hilarious, trust me. plus, that entire game itself is really unrealistic "hey, where i come from, this guitar makes noises. here, it blows stuff up." if your mother think's you'll be inspired by jack black of all people to go into public and attempt to electrocute people with your power of metal, she's f**king paranoid.
avoid zombie shooters, because they might be possibly the most fun ever, there's only 1 good zombie shooter out right now, and that's Left 4 Dead 2. my friend has it, and he says valve did a really good job detailing it. if you shoot a hole-in-one (NOT A PUN, GO AWAY GOLF NERDS) you can see right through the zombie, plus all the blood and intestenes fall out and drop on the ground. the game plays just like the perfect zombie movie. come to think of it, the game is EXACTLY like the scene in dawn of the dead where they come out from under sewer pipes to run to the gun shop, and at the end where the 4 of them get to the island swarming with zombies. but only two those scenes. the rest of the movie they're either in a badass bus, in the safe security of the mall, or in a group larger than or equal to 5.
Finished with my woman 'cause she couldn't help me with my mind
People think I'm insane because I am frowning all the time
All day long I think of things but nothing seems to satisfy
Think I'll lose my mind if I don't find something to pacify
Can you help me
occupy my braaeaain?
Oooooooooooh yeah
i love that song
also, i asked my mom for a bit advice, and i actually got a good idea from her, i'm shocked. here's what you do: choose games within your rating range (eC - T) and show your mom videos of game content from T games only, no M+17 games. showing your mom content from M games is just stupid, she might not let you play T games if you keep doing that. it's actually a really good idea, the more T games you show her, the more she will accept some violence (over a long period of time of course. but at the end of that period, you'll probably be 15 or even 16 which when your mom might let you play some M games).
i know i wrote a lot, but if you wanna play MW2 with the big dogs, read it.