If I may be allowed a bit of bragging I
platinumed ME1 and 2. :3 I don't get to do that a lot because most games have some multiplayer achievements that I don't care about getting. :\ Gears of War is pretty bad about this with I think 1,000,000 multiplayer kills to get one in the first game, and nah, I'm not doing that, especially this late in a game's life. Anyway, if it's a lack of interest on your part that's one thing, but if it's a matter of difficulty I suggest using either the Soldier or Infiltrator class in ME1; they get access to an ability called Immunity that is ridiculously broken. Basically once you max that out (and the relevant class evolution, which is Shock Trooper for both iirc) that ability makes you all but invincible for 60 seconds, and the cooldown on it is like 55 seconds... so basically every time it runs out you can just activate it again. You do have to put time in to ME1 if you want to see everything, though; I can run straight through the campaign doing as little sidequesting as possible in about five hours on a repeat playthrough, but it takes about 30 or 40 to do everything whether or not you're using a character you previously beat the game with.
@wolfchild & Zako: I have the BG TUTU, but I dunno. It's the same problem I have with NWN and Morrowind and Oblivion. I'll make a character, get like twenty minutes in, want to try a different style, get twenty minutes in, want to try a different style, start back at one. What class do you guys recommend?