Btw, i'm not a D2/D1 fan anymore. I actually find it boring and repetitive and i've last played somewhere in 2004.
Its just that nethack is not some pinnacle of RPG design as many think("a classic gem"). Diablo series isn't either(its filled with flaws and design dead-ends) but its widely emulated in RPG design.
Graphical real-time RPG will always be the furthest reach the RPG genre will attain, regardless of sophistication of games like Nethack which is inherently limited in its presentation and interface.