I actually suspected something like this... I think I knew that the definition of isometric was actually fairly specific, although I wasn't sure on the details. But I think that when referring to games, the common usage of "isometric" typically includes all types of axometric projections. I also assumed that the OP would be OK with top-down games (like the Ultima games, discounting their 1st-person segments) since those end up playing in a similar manner to isometric games.

Divine Divinity might not technically be isometric either... it contains walls that are horizontal relative to the screen, giving it a weird skewed perspective. Still, I imagine that it plays almost identically to a true isometric game.

I'm fairly certain that the indie games I suggested are all actually isometric, or at least one of the axometric projection types.

^ Yeah, I wasn't trying to be a douche or anything. I just thought it was funny that Fallout 1 and 2 are not isometric. I don't mind people calling them isometric even though they're not.

You're right, Divine Divinity is also not true isometric; it uses a cabinet projection.

True isometric RPGs would be Arcanum, Diablo, Ultima VIII, Jagged Alliance 2, Super Mario RPG, and so on. There don't actually seem to be a lot of them.

I can't even remember if I bought Ultima VIII on here or not, this is how badly I'm falling behind with my gaming... Still haven't played Divine Divinity either.

Ultima VIII seems kind of crappy to be honest. IV through to VIII Part 2 seem like the ones to play. I've only played IV extensively so far, but I wholeheartedly recommend it.

I think if you're into Arcanum you would really like Divine Divinity. It's an action-RPG, but with as much in common with traditional RPGs like Ultima and Arcanum as it does with Diablo. Despite its tactical nature, I actually think that Icewind Dale is closer in spirit to Diablo than Divine Divinity is.

If you're not too picky about having an overhead view, the Might and Magic series is also worth checking out. It's the same style of game, except in first person. Might and Magic VI in particular is pretty crazy because it has a huge, detailed open world combined with a huge dungeon crawling component to it as well. It's pretty unique, probably my favourite RPG.

I haven't played Neverwinter Nights 2 yet, so I can't comment on that. But I have played Dragon Age: Origins, and I think it counts as an old school, hardcore CRPG with an overhead view, though there were some major problems with the game. Ditto for Drakensang: The Dark Eye. I haven't tried the newer Drakensang: River of Time yet, though by all reports it's a much better game than the first. But if you hate Neverwinter Nights 2, you might not like these games.

Honestly, just play torment. It is the only reason I found out about this site and I have to say if you enjoyed Arcanum's replay value and storyline then you will love planscape torment.

It is by far the best RPG I have ever played to this day and I played it back in the late 90's when it released.

It has everything you could want in a story driven game and the amount of depth to the portal system of planescape is mind boggling.

An example of how the entire game is determined by your decisions; kill a lot of innocents and see what happens...hint: save before doing this.

Not sure how I feel about the exclusive nature of the endorsement, but it comes from the right place and I can second the enthusiasm and targetting.
Planescape: Torment is quite thoroughly amazing. The old 2nd Ed. system might take a little getting used to, especially the exponential table for the stats, but most of it's under the hood and not a big issue for the player.

As others have said, Planescape is a must play. In a way it reminds me of a more forgiving Baldur's Gate 2, since you can freely switch classes from Warrior to Mage to Thief without being hobbled into some sort of dual-class weakling. Divine Divinity also had a similar mechanic, where you could explore all three class branches when leveling.