They're not that similar at all.It's sort of a different style but at least in my opinion they share a lot of similarities where I think oblivion is better. There's an actually map and world to explore with 20x the content as NWN and there is a lot more freedom. In NWN2 you are extremely limited in what you can and can't do, something I think is awesome about oblivion.
I suppose if you were coming from JRPGs the "make your own character/morality" might be considered as such, but NWN is designed for a campaign type adventure. A single story. The included campaign is an example of what can be done. You want more stuff to do? Make it yourself, or download one of the many fan-made campaigns. Part of what NWN/NWN2 are is the ability to make your own campaigns and run them for multiple players.
So no, you're not going to find the world-roaming, sandbox type approach that Oblivion has. The official campaigns is a more linear game that you can make choices in, much like the games based off of NWN...Jade Empire, KoTOR, and by extension, Mass Effect. It's in the same style as prior DnD games as well. If you've played Baldur's Gate games, Icewind Dale games, etc...similar in freedom, style, etc.
But the main thing with NWN even compared to those is the ability to make and/or run your own games. To use the game as a way to play DnD with friends. That, to me, is pretty far from what Oblivion tries to do.
I'm not trying to say that NWN's approach is necessarily -better-, but that the two games are only similar insofar as that they're both RPGs.
Performance isn't so much the thing for me. The game runs fine on my system. It's more that 90% of the time, quitting the game will hard-lock my machine. Of course, opening a door in the game might do the same thing. Or hitting quicksave. Or it might just lock up when walking around. Who knows.I haven't noticed any performance issues on the PS3, not sure if it's different than the PC. It lags every now and then but it's just a spike that goes away as fast as it arrived.
Will save games actually load? Hard to say. I make sure to save in multiple slots because I had to restart the game at least once already due to a corrupted save that would lock up when I tried to load it.
Most PC games are not nearly that craptacular. I mean, I've had trouble with some before. I stopped playing KoTOR 2 because somehow I got stuck with debug menus instead of the conversation options that'd progress the game...but Oblivion takes the cake for lack of stability for me.
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