I can't call myself as a fan of Resident Evil, the games or the movies, but I have seen all of the movies and I think this was the worst one. It's not the end of the franchise either; I realize they never indicated Afterlife would conclude the "story", but this movie is just a placeholder. It's just a bunch of stuff that randomly happens (in 3D! Oooh!) after the last movie and before the next movie (and there will definitely be a Resident Evil 5). Ugh.
You take the other set to half-price books and get some cash back. Or trade it into Gamestop or somewhere for credit. Or you could donate it to charity. Good thing I was smart enough not to buy into that special edition crap on DVD a while back.