User blog comment:The Shadow User/Squadmates in Mass Effect 3/@comment-730941-20101014105000/@comment-730941-20101015060242

I suppose it's a natural part of game design that they need to keep inventing new weapons, features, items and locations (otherwise it'd get really boring and repetitive). I do have a problem when it gets to such a large extent that it undermines the credibility of the universe.

The yahg thing was relatively well explained (I mean, they were an obscure race on a planet that was heard from once and never seen again) - but we never heard drell mentioned in ME, and suddenly within two years they're a huge part of ME2. To a certain extent I can say the same about characters like Aria and the Illusive Man, or even the Collectors - why has Shepard never heard of them, if he's a Council spectre and has access to the best intelligence the Council and Alliance can get?

I'd just feel it was taking things a little too far if Bioware found another race to introduce for ME3, unless it had a fantastic reason for not appearing in the previous two games.