I took some time to watch this last week.
Gotta say, I was expecting worse.
The only things I didn't like were the combination of both RE1 and RE2 into a single movie, and the portrayals of Leon and Jill.
Goddamn did they fuck em up, Leon more than anything.
Outside of those, I liked the portrayal of Chris and Claire even if it differs a bit from the original RE story, I liked the little changes here and there they did to the plot, and it has some sort of B-movie flavour to it with a rather decent production quality, which is kinda refreshing in this day and age.
However, I can see why some people ended up not liking it, it's not for everyone.
But hey, if you're a fan of Resident Evil, and/or like to have some cheesy B-movie-like flick, go for it, it's enjoyable.