Just finished the campaign yesterday, and it sounds like my experience was pretty much like most other folks'. I enjoyed the game on Jedi Master, but the combat never really felt balanced -- most regular enemies were still too easy, while some where cheap-hard. The fact that stims only seem to actually work like half the time was particularly irritating and caused me turn down the difficulty on some of the boss fights because they didn't seem fair.
The levels are just hard to navigate, and the game badly needs a fast travel option. I will probably start tracking down collectables now, but honestly I'm not really looking forward to it. Backtracking in Souls-like games is usually fun because you get to truck enemies who gave you a hard time your first run through, but it's feeling kind of grindy already.
Still, it was a good single-player melee-based Star Wars game with an interesting story. I'll take it. Looking forward to the next-gen sequel.