Monster Hunter is a great game if you can get into it. It's hard to recommend playing the demos, since they rarely go into detail on how to play. I remember playing the 3U demo and hating everything about it, but after playing the full game for an hour, I was hooked. The basic process of the game is kill boss, get drops, make gear, kill harder boss. It's repetitive, sure, but it's a satisfying formula nonetheless. The games also tend to have a rather nice difficulty curve, giving you ample chance to upgrade your gear before fighting harder stuff.
It's definitely worth a shot in my opinion, especially if you can get some people to play it with you.