I completed all of Umbrella except the mission in Europe and some of the little bonus missions.
The game is much too difficult at times. I like Darkside because it isn't hard or easy, plus the controls are better and it has my favorite RE, RE2 in it.
Even Ada's "death" is HORRIBLE in Darkside Chronicles. It makes NO sense lol she "dies" but doesn't have a scratch on her and her voice actress was bad.