Wow. I get it with the melee, okay, it is unrealistic that the knife wins out over the LMG, I have personally experienced that same frustration on more occassions than I can count. That said, while from a realism point it may not make sense, from a gaming point it makes perfect sense. In a shooter, melee should be rediculously high powered, because getting close enough to someone with a gun to deal a deathly melee blow is not always going to be easy. So, suck it up, because it's part of the balance of the game.
As for your other, primarily aesthetic complaints, again, I agree, the maps are boring to look at (exceptions I would make are for Terminal and High Rise, I haven't played any of the map packs), but people didn't buy Modern Warfare because they wanted pretty scenery, they bought it for a tactical shooter, and in that sense the maps deliver.
If I were you, I'd just try to calm the fuck down. Getting your panties all up in a bunch over something this small really isn't going to get you anywhere. If you don't enjoy it, don't play it, and leave the rest of us to enjoy the game in peace.