For a multi-character RPG, the Black Isle games have the best system - real time with pause to allow instruction to be given as needed.
For a single character RPG, Diablo 2 has the best system.
I truly dislike 'turn based' CRPGs. The whole flavour of the game is utterly ruined, and the gameplay slowed to a ridiculous pace.
The only way it works is with the FF8/Septerra Core idea of limited-scope combat, with no attempt made at a 'realistic' combat style whatsoever, and no way to lure opponents into ambush or draw them away from an area you don't want them in.
If Div had turn based combat in its current format, it would be unplayable.