I liked this game, but it was probably my least favourite of the 3 campaigns; I'm just not that invested in the Protoss characters and saving their campaign to be the big climax to the SC2 story was a bad move as far as I'm concerned.
It also felt like there was a lot less mission variety in the main campaign, it was almost all base building, I prefer the hero missions that were more prevalent in the other two campaigns.
I haven't gone too deep into the other modes, but I've had some fun with the coop missions and can see myself spending a bunch of time in that mode going forward.