I would recommend MH4U or Gen.
MH4U - There's no arts or styles, so it's more of a 'classic' monster hunter experience.
Generations: Access to all currently existing weapons, you have arts and styles to play with. Less of a classic MH experience, but still incredibly fun.
Torchlight if you'r into ARPG. Farcry 2 and Star wars Battlefront 2 if you like shooters.For JRPG you can try FF pc ports and The Legend of heroes series.