depends, if you are desperate, go play diablo 2 with the LOD expac, well thats my recommendation anyway, graphically not anywhere near granted, even with the HD patch, but a better story a million times over and it actually has random maps, something sorely lacking from d3, if you can wait a long time (or soon (tm)) the expac for D3 could offer some hope
by dice roling i presume you mean D&D stylee, specifically of that genre i would say if you havent tried yet, baldurs gate, or the neverwinter mmo, which i enjoyed beta testing, though truth be told it really is pay to win if you want the absolutely best gear, on the same note i would say take a crack at pretty much anything elder scrolls and fallout 3 / NV could be worth a swing for you