It's pretty rare for me to not like a game and then decide it isn't so bad after all later. The only thing I can think of is Street Fighter II. I played some iteration of it in an arcade when I was younger, but I wasn't much of a fighting game fan at the time so the finer points of the fighting mechanics were lost on me leading me to hate it. The fact that my next experience with Street Fighter was EX on the PSX meant that my opinion of it wasn't helped. Luckily, I've since bought SFII HD Remix and SFIV and I consider the former to be one of the best fighting games I've ever played.