Mercenary lord change was a straight up nerf wasn't it? They only get the bonus when the hero w/ merc lord is nearby?, I doubt anyone will take it now since camps are usually advantageous when you push another lane while mercs push a lane. Most heroes have a better talent to take then bribe, only a couple of supports I think didn't have much better to take, all the specialists have something better.
I like all 3 of those specialists, nazeebo is definitely the best of the 3 in teamfights and gazlowe the least useful, but gazlowe is probably the best pve of the 3 w/ his turrets and you can also use his turrets to zone ppl out of objectives.
Also, abathur seems really strong now, even his early game seems rediculous. Played a game last night and early game was me on uther and a thrall against thrall/aba and their thrall was able to push to our towers while we focused just him and his health barely moved and never went below 80%. That might also have something to do with thrall's passive being op.