I dunno, maybe it's because I missed the Armada Unicron. Maybe it's because it was the first TF I got for Christmas in ages at the time, but I actually really like the EN version on Unicron. Sure he's the most inaccurate of the colour schemes, but considering the colour scheme, I actually love the originality of it.
TBH, it honestly looks to me like the Borg travelled through a rift and assimilated him- either that or he was assimilated in the Star Trek Universe.
That and the idea of a deep booming, disjointed Unicron voice booming "I AM UNICRON! RESISTANCE IS FUTILE!" seems like it'd really be cool
As for what I find overrated (and it comes down to owning the fully functional versions and so I'm very aware of the butcheries); Blaster, and the Medium and Large Machine Wars toys are right up there. For all the colour scheme improvements, the toys have been thoroughly gutted.
It's hard to figure out who fares the worst. Optimus Prime gets out of it with the least butchering, as despite his nerfed missile launchers, the missile bays being left empty does work stylistically.
After that it's kind of a tie. Sandstorm only has his launchers gutted, but they didn't even bother recasting the guns, so there are holes in the guns that make it completely noticable how gutted the weapons are- along the noticably empty missile hardpoints. Soundwave winds up with no weapon at all and a gutted supersight function.
Starscream is worse- gutted supersight, no weapon, and gutted bombing reticle.
The worst offender of all though would be Blaster. Compared to the Microchange version; all the electronics were gutted, all moving switches solidly hard cast and the earpiece removed from the gun while leaving noticable holes where it combines (in the case of one of them, gaping) on the gun.
These guys go to prove that when it comes to TFs, there are reissues, recolours, retools, and eviscerations......