Ok, bear with me, this might be a long one, but here’s my take on Dwarfs in 3rd Edition:
I can’t see any serious drawbacks, even Throwing Mastiffs are worth taking now. Nearly all entries are much more balanced, there’s more incentive to take troops/irregular units (Rangers, Sharpshooters, Mastiff Hunting packs, etc), and the units that did take at least a minor nerf (organ guns, battle driller, Brock Riders, Earth Elementals) either needed it or got something to make up for it (cannons! bombards! stoneshaper special rule!).
I’m actually pretty excited about Ironwatch - put that in the book of ‘things I never thought I’d say’. Ironwatch Hordes help with unlocks, project more threat than organ guns, can move and shoot (poorly, but still), Unit Strength is more important in this edition, and there are a few good upgrades (specifically the Dragonshard Shield). Its not so much a ‘boost’ as it is a ‘better by comparison’ thing. I just wish there was something besides a minor point difference to help incentivize Crossbows over Rifles (range boost, Elite, no ‘pot shot’, something…).
All in all, a lot of good additions that help Dwarfs hold up in attrition fights (which they should).