Then tell me, why are there still many on SL, why after stop selling SL Apple decided to get it back, why do so many people prefer SL.
I never had SL, could not upgrade from PPC back then but it was similar to Leopard and probably the best/better OS.
I have an old PB on Leopard and a 2012 Mini, had to get used to ML, like it better than before but if I had the choice to go to SL I would go back.
Plenty of unnecessary eye candy in ML, still plenty of bugs although it is getting better.
Plenty of dumbing down the OS and some of them do not even work that well, TM for instance, not needed when there is CCC or the build in command line tools, yes the latter is geeky but CCC not so much.
iTunes, Appstore are slow as molasses, they sometimes don't even recover from slow or internet dropouts, really not that nice if you are on a capped internet connection.
Plenty of reasons I think ML still has too many problems, they won't get resolved like so many bugs in Lion, Apple will just release the next (unstable) OS without even addressing most of the bugs in the former OS.