See, the problem is that it's pretty hard to implement TB combat in multiplayer, which is still NWN's main aspect, even if Obsidian really makes a good singleplayer campaign. The cornerstone of NWN is multiplayer, DM-shards, toolset...
Of course, it would have been great if they could afford to create two types of singleplayer, with different combat modes, but that's one helluva trick to pull off.
And just how you see TB implemented in NWN multiplayer? And really, it doesn't hurt the gameplay much, at least in multiplayer -- yeah, the tweak-aspect is there, because you gotta be qucik, but again that involves some tactics -- you assign the hotkeys, you keep all the sequences in your head, so that you wouldn't stutter in the middle of the fray, so that's pretty intensive.
Of course, in singleplayer RTwP is much worse... However, I did enjoy magic a lot. The melee, though, is awfully repetitive, because most of the great DnD feats just cannot be implemented in real time, it takes a full TB to do it.