It's pretty fun, but its very much a MOBA. Matches usually take too long(30+ min), csing/laning is not really enjoyable (to me). The potential for massive power differentials based on items and balance. The shooting mechanics are pretty simplistic, though seeing how the game actually works (as a MOBA) that is probably a good thing.
It will be good probably for people who are already fans of traditional MOBAs with these elements. I'll play occasionally with my friends. Needs more heroes
HOTS is actually an amazing MOBA for people who don't like MOBAs in that it eschews overlong matches (usual like 20 min), it has simplified itemization, decreased emphasis on perfectly farming your lane, etc. Definitely better game than people give credit for.