I know a lot don't like 5 because it isn't Jason but I thought it was good.
The reason I don't like 5 isn't because it's not Jason, it's the lack of creativity and gratituous violence that is so prominent in the other films. Almost every kill in that movie happens off camera or as a cut away to another scene.
Watching these movies growing up, for me, it was all about looking forward to the next kill throughout them; how Jason was going to take his next victim. Without that, or those events being downplayed, it just doesn't feel like a Friday movie. That is why it's my least favorite.