Except that, T can get ghosts and or ravens pretty easy on one base. Try getting HT's with psi storm in with your normal army on one base. its lolololimpossible. But I would be happy with the HT getting a slight speed and hit point boost, to make it less terrible in comparison to the ghost. As if the ghost didn't molest the HT enough in every comparison, but hey guess what it gets an attack too!!.. Another possible fix is to require EMP reasearch, 100/100, 50 seconds. But in truth, I think nerfing the mule will balance everything alot more than any other suggestion put forth. unfornately none of this matters and none of it will ever be done, because blizzard doesn't care about non pros. TL : DNR, I play protoss because winning with T is too easy.
If winning with T were too easy then we wouldn't be seeing zerg win gsl twice in a row and protoss win blizzcon, right? I personally find terran harder to play than protoss... Have recently been trying to play some T and Z to swich to random and while I do ok-ish with Z I find T much harder to fit my playstyle...