Gun Survivor was crap. Gun Survivor 2 and 3 where better but still crap. Dead Aim was average. The reason why all of THOSE games sucked is because you had to aim using a d-pad, as well as stop moving to shoot.
Umbrella Chronicles and Darkside Chronicles simple move to an on rails shooter format and the games are much better for it. It's worth a rental at least.
I've not been a fan since RE2. I've played and finished every game but I always disliked their change of direction. I do want to play RE5 once it's on a steam special... simply because coop zombie games are amazing IMO.