Understandable, although I hope you don't ignore games purely because they're lacking in the graphics/animation department.
There are lots of games older and worse looking than SR2 that make SR4 look like a half-baked indie game.
Tell me about it. Counter Strike was released in 2000, yet still pwns all other FPSs out there. I've been playing it since I was a kid and I'd play it over Call Of Duty Advanced Warfare anyday.
Its not that I did not enjoy SR2 at all. There are times when I miss the good things in it. Remember SR4's opening sequence when the Boss says,"Where's a septic truck when you need it? *Sigh!*". Yeah. Those times.