User blog comment:An Arcanine/The Evolution of Classes./@comment-24174486-20121023221715

I disagree with your views on the Infiltrator. In ME1, they only had three offensive powers (Overload, Sabotage, and Damping) and cooldowns were significantly longer. ME2 gave them two powers (Incinerate and AI Hacking) and shortened cooldowns. The Infiltrator's powers in ME1 were primarily to disable and expose enemies; they didn't do enough damage or cool down fast enough to serve as a primary means of offense.

I honestly don't see how Sentinels were ever really a squad "support" class in any way that the Adept or Engineer aren't. They don't do anything that any other biotic or tech classes don't.

The Sentinel class is really the only class that through an evolution between games, not in terms of powers but weapon ability. They started off as the absolute worst class with weapons (ME1) and then went to on par with the Adept and Engineer (ME2) and eventually surpassing them (ME3).