I liked it for the original plot, plus the gameplay changes were great. To me, anyway. I liked the original plot, and it was pretty deep. The fact it jumped so much between characters kind of bugged me, and I particularly disliked Quint & Keith over the course of the game, and their first couple lines already made me realize I'd hate them.
"Awwww, I hate snow!"
"Snow hates you."
However, Keith kinda grew on me over time. So I didn't hate him by the end, nor did I dislike him. But I didn't particularly like him either. Quint, though, I just hated him completely.