I liked the first RE movie ok enough, they made it so it almost could fit as a prequel to the games, or at least happen at the same time. After that it went bad.
I didn't hate the 2nd or 3rd one but they had way too much dumb in them; the Alice vs. Nemesis fight in 2 and 3 went stupid with the "T-Virus kills the planet" crap. Which they turn around and pretty much ignore all that in 4 and 5. The last one was awful even by the other movie standards, it simply made no sense at all.
What I really hate is how Anderson just throws in stuff from the games to try to tie them to the games, when in reality the games at least kinda explain why they are there, like Las Plagas and the Executioner guy. In the movies, they just show up for no freakin' reason. And how they throw in game characters who look like the video game characters but really are nothing like them. Like Leon Kennedy from the last one....looked dead on like Leon from RE4, acted NOTHING like him.