MopKnight wrote:DnD 3.5 isn't a good system past level 15ish.  Most of the balance issues we see are primarily due to overdependence on multiclassing and the marginalisation of the d20 roll for randomisation.
I don't think there is an overdependence on multiclassing, as many classes are powerhouses even when pure (Paladin, Ranger, Warlock, Cleric, Wizard, Monk, Druid and Bard make for truly excellent pure characters, pretty much on par with any and all powerbuilds you can create). I'd say it's a mixed bag, at that.
I personally view the marginalization of the random aspect of combat a positive thing, allowing great plays instead of making literally everything a matter of luck. Coupled with the incontrovertible fact that everything added in game has counterplay, it makes for a healthy game environment where your skill floor remains very low, and the skill ceiling is higher than your version (basically, characters become stronger as players do).
DnD 5 is far more random and unstable than 3.5, at any level and as such is a far, far better system for ensuring a lack of dominance of classes or specific builds, even though it is still entirely possible to powerbuild.
We really don't have such a dominance in BGTSCC. A great many characters and character concepts do exceedingly well here. Instability just diminishes the good player's weight on the game, which on NWN2 (excluding PvP, which is however irrelevant) is significative.
Generally, the smaller the difference between a level 1 and a level 20 (meaning a mob of level 1s can deal with a 20), the better the system.  You can't do that in 3.5 no matter what level cap you have in.
I view this as intentional. As example, you can take the Lord of the Rings universe: Thranduil won't be killed by simple orcs...no matter how many they are. In the last Hobbit movie, he charges alone in the middle of their army across a bridge, and by the end of it, he had a few piles of corpses around him. That's what a NWN2 character can represent, if its player wants: someone far beyond "commoners'" league.
Moving towards 5 in general would actually be a great move and I'd love to see how feasible it would be.
I respect your opinion, and maybe it would be.
It's just not the way I want to play this game, and not the way NWN2 was created.