I for one found that the Collector origin story to be gimmicky. Would have been much more interesting if their race had a more fleshed out background, then the simple, oh no, now you are fighting mutated Protheans. Not saying it isn't feasible within the ME univerise, just that the Collector origin story could have been much more interesting. Like an ancient species from millions of years ago, and they were like the only organic species to accept the Galactic purge (similar to how Saren reasoned, and was eventually indoctrinated).
Does anyone else that the Collectors as "mutated Protheans" cheapened the mystery and discovery of the Protheans from Mass Effect 1. (Arguably one of the more interesting facets of the first game).
This is my opinion and I'm not stating this as fact, so I'm really posting this to see what others think. Just thinking it would have been way better if they had a more creative origin. Maybe a species from outside the Galaxy that sided with the Reapers? I mean, mutated Protheans, come on!?