Im currently playing re5 on ps3 with my daughter, we're both hooked. It's a great game to play together with someone. Did you get the download content for re5? It looks pretty good.
I played and loved the original but never played zero. Played the second and didn't like that one as much. Never got the third but had code Veronica for the dreamcast and liked that. A few months back I got re4 for ps2 And got pretty far in that but never finished it. I can see myself finishing 5 a couple times to unlock e erything like I did in the first one. Btw, do you remember resident evil directers cut which was hyped for having the originally banned opening for re (the one they used in japan but not here), but then they backed out and only rearranged things in it, hardly worth the hype but was still some fun.