It hurts to see the fast worker not getting tons of love. Being able to move into a jungle or forest and immediately begin cottaging/farming/etc saves tons of turns, creating CEs and SEs so much faster, along with mines for a quick swap to a wonder, just poofs up there and starts up, flying all over Gandhi's big empire. Definetly a top 5 UU IMHO.
As for musketeers, yeah theyre nothing special, the movement point is amazing in the right situation, or when coupled with a knight/spy revolt attack with CGII to keep those cities well defended with no counter, starts a war off well
Bowmen have saved me multiple times against an aggressive neighbor without having any copper nearby and IW being the dead end tech it is you dont have to beeline it for defense with them, feud comes and you upgrade, but you're set until then, plus they keep an HA stack in a city safe if Shaka comes calling with cats and impi.
My vote of the worst would have to go to the Impi, their extra movement point is nearly useless since at their time theyre basically the only unit that has more movement, i know some people are goin to go off about the tree that they have, but when you have them in a stack of swords and cats, its useless. Plus it has no synergy with HA's, the only 2 movement unit close to their time.....or maybe im wrong?