He's apparently broken as all fuck. Basically he's a zombie pusher, drop egg in your base(so people can't kill it) and just head down the lane suiciding on the enemy towers until they drop, repeat until lane is dead. Only decent way to counter is to have Zeratul blink inside your base and kill the egg, or well destroy the base so you can find the egg in there.
Biggest downside of this patch so far is they still haven't fixed not getting gold at level cap, and removed all hero bundles, instead adding shitty 1hero+skins bundles. So you can either buy one hero, or one hero and his skins, there's no more multiple heroes bundles.
New UI is also...not really any better. It wasn't very good before, it's still not very good, for different reasons.
Edit: After playing a few games, Murky is actually pretty fucking shit. Countered by MULE talent, does more or less jackshit in combat, he only wins games when the opposing team is twiddling their thumbs not doing anything since he pushes really slowly. Garg Witch Doctor can rape a lane in 30seconds but Murky needs several minutes to do the same unless he's laying his eggs very close, in which case he's easy to counter.