Fighting some bosses for a node in a level 1 area with a level 26 character took a pretty long while. No real danger, since they do mediocre damage, but they did have a lot of HP, and there were 2 giant skelebots and 2 crippled dragons. I have no idea how I'd manage that at equal level...
Also a few things I wondered about. Should two hits from an ice bat kill all your movement? I can see it slowing you down, but just stopping you in place feels wrong, especially since you can still jump just as easily, but lose all left and right movement. It also seems odd to get this same effect from a bat 25 levels lower.
Other thing, the HP of low level spawners seems much higher. Before the rebalance, I was able to knock them out with two or three fire touch applications. Now they take much laonger.