Not very far into the game (Chap.10), but it is going well thus far. Once in a while, after a few hours of playing, the game, when changing chapters, comes back extremely slow (unplayable). I need to exit it, and get back in to continue. I am using the default video parameters. That is pretty much the only bug I have experienced.
Of course, this is a very linear game. There is but one path forward, although it is possible to travel back to places you have been, once you get at milestones (usually, chapters).
The dialogues are informational at best. You cant change level once the game is started, so if you get stuck somewhere at some point, before a milestone, there is no going back, because travel is only possible at milestones.
All in all, I bought it because I am a fan of LOTR. I prefer LOTROnline, though, despite their own problems of graphic resolution and memory leaks.
My system is:
Processor 2.93 GHz Intel Core i7
Memory 16 GB 1067 MHz DDR3
Graphics ATI Radeon HD 5750 1024 MB
Software OS X 10.8.5