That's a fair point. If they pared down the any size fits all heroes and released only niche heroes then it wouldn't feel as bad.
As it stands, they their "best all around" heroes early in the development cycle (ETC, Muradin for tanks. Rehgar, Uther for heals and so forth) and nothing that isn't similarly well rounded can displace them from "nearly always a good pick" category.
It's kind of like familie's love of Chromie and Maledict's detest for her. I feel like she's what a mage hero should've been from the start, but instead we got KT and Li-Ming so she feels crap in comparison. If she'd have been the first, though, and pioneer of the "mage" in HOTS perhaps it could've been different at this point. I don't really know if that's the case, I just find it interesting to think about.