I've been readin these comments and im confused. Rly confused...
Think of ME2 as prologue for ME3. Regardless of what others may say, its true. Some spoilers for interested ppl, u start as Alliance crew investigating missing ships and stuff then u get shot down by prothean ship. Almost die until Illusive man resurrects u. Which is crucible fact in ME3 ending. Since now you're smth between synthetic/organic. Besides in ME2 you learn bout protheans and eventually fight against them. While in ME1 you have slight idea what they actually were trough obelisks.
And ME1 is smth like introduction to the world of Mass Effect and its destined destruction. Which you fight against in whole series.
ME is one of best adventure series ive played last few years. Great story, ME2/ME3 gameplay has been improved since his predecessor. Im not particular graphic lover but 2nd and 3rd game had good graphic for its time, or it is so for me.
Completed it few times as female Vanguard, has so much combat variations when u learn all tricks
Anyway start playin from Mass Effect 1, u wont regret a thing even if it has "low" graphic. Story will keep u playin on