Good, but not great. Game play gets repetitive.
Like Diablo, isometric play is smooth. Provided you have the correct hardware. I could not play this game on a SLI nVidia machine. Graphics would not initialize, but any higher end Radeon or single card nVidia it works fine. There are a few spots in the game that will tax your graphics adapter. Multi monster battles can slow down graphics response or hang your system. Running in windowed mode does seem to help.
All in all one of the better RPGs in the last few years. The mythology aspect is quite fun. There are many variations to weapons and armor to try, along with skill sets to customize your character.
Save points are frequent enough to not loose too much ground if overcome in a big battle or locked with a graphics glitch. Be sure to clear areas, leveling up is needed as the game play gets tougher as you progress.
If you are tired of waiting for Diablo 3, this is a fun way to pass your time.