Everything was difficult to hit in Morrowind -- I don't think Cliffracers were any harder than anything else. It might not be typical, but the Cliffracers in my game mostly just flew straight at my face and hovered there for a while till I finally got a swing in.
The actual 'hit box' for Cliffracers was ridiculous.
That was half the main problem with them, other than the fact that they would randomly spawn on your head and then attack mindlessly without any reason. Then again, most Bethesda creatures mindlessly attack without any kind of reason. It's a shame... but maybe something they'll fix the next time around. They sort've got half-way there with Oblivion... and then took a huge step backwards for Fallout 3.
Only time will tell if they decide to dedicate any effort to realistic animal behavior or not.
But I do know that Cliffracers get a lot of undue hate, simply for the fact that people somehow thought they were annoying.
More annoying than rats? Or mudcrabs? Or getting randomly attacked by Nix Hounds while waiting on top of a 50-foot mushroom?
Someone here said that it was Morrowind. Morrowind makes me like them, mindlessly?
Give me a break, that is the saddest... lamest excuse for discrediting people who disagree with you I've ever head. And sadly, I've heard it more than once.
I think they should come back for the same reason I support the Enclave in Fallout... because they didn't get a fair shake the first time around, and deserve another chance at being done well. I always wanted a pet cliffracer, actually. They could probably make amazing pets... the Elder Scrolls equivalent of a falconer.
Oh well...
... I wouldn't hold my breath, even -if- folks around here who wanted them back had the majority.
But it -would- be nice.