I notice the slowdown sometimes, but the framerate doesn't bother me in the least. What *did* bother me was that the first 10 hours of the game are like a boring tutorial.
In fact, if I had bought this game I probably never would have continued playing it. However, a couple of my friends who are casual loaned it to me and they loved it, so I kinda felt like I couldn't turn around and just hand it back after 4 hours of play and say "Yeah, this sucks!"****
Once you get about 10-12 hours in it starts to pick up big time. I'm about 27 hours in now and if you could rate "fun" I'd say I'm having about the same amount of fun as I did with KOTOR. The other side is that the game has quite a bit of glitches.. I apparently haven't hit any of the big ones thankfully. Basically they should have just changed the 6 hours I spent on Peragus into a short opening cutscene and had you start on Telos Station.
**** And I loved KOTOR, so I kept thinking boy it has to get better at some point.