I was combat for the first 30 levels or so. Had no problems. The guy at the end of act one, one word: Interupt! Even as combat with 8s CD and no 0y jump you can still keep his big hitter interupted.
Do that and he's easy. I killed him with 75% health left and kira on full. This is essentially true of all the "Caster" style bosses. "Melee" style bosses seem to be much more about raw DPS output, proper use of defensive CDs and correct companion.
Saying that, once I got into early 30s I started having real issues with Golds my own level. That first quest of chapter 2 kicked my ***.
So I gave watchman a go. End of problems. Better interupts, self healing and much better damage brought it back to fun times.
So watchman made things easier, but I still had to be careful. I could kill any normal group, or gold, but if I messed up and pulled more than I meant to, I was dead.
Getting Doc changed all that. Normal groups/golds were easy, I had no down time between them, and if I did mess up, I still had a good chance of making it thru anyways.