I beat the game on Hard and found it way too easy. :/ Gonna try Brutal next run.
I'm still playing through on Hard right now, but my brother is doing a Brutal playthrough right now (he already finished on Hard) and he said it's noticeably easier than WoL Brutal.
I thought WoL Brutal was a bit too difficult in the first place, it never really felt fun. I have a fairly extensive amount of mechanical skill and it was more often frustrating and grinding than enjoyable and rewarding. It was almost like a puzzle in that there was only so many ways to tackle the mission. Deviating from the optimal strategy even just slightly would force a checkpoint reload at best. I finished it, but I didn't enjoy it.
If that has been even slightly addressed in Heart of the Swarm, I will consider it for the better.
My brother and I are both Master League, him Top 8 even, and we both agree that Brutal in Wings of Liberty was poorly balanced.
I'm finding Hard right now to be fairly enjoyable, but yes, far, far too easy. If Brutal is balanced properly in HotS I may very well enjoy it.