Beast Barbarian. Thumbs up. Tail is a little less useful than the others, but bite and claw are both nice. Permanent swapable movement boost is great. Con scaling damage booster at 10th is nice, and being able to give party members reckless attack is just icing on the cake. Really like this one.
Mercy Monk - Ki point for a touch range cure wounds is nice. Being able to chain it with flurry of blows is even better. Hands of Harm synergizing with Stunning Touch and the poison aura looks great. Ki point restoration at 11th level adds to the kit, and the 17th level imprison/preserve is nice and flavorful. Another thumbs up.
Watcher Paladin: Initiative Aura, turn ability against a decent range of creatures, mental stat save bonus with Channel Divinity are all pros. Obvious intent as anti-caster/anti-outsider paladin. Spell list is kinda blah, though, and the overall package is pretty underwhelming compared to some of the other paladin subclasses. Not bad, overall, just not super exciting.
Noble Genie: Not a big fan. The expanded spell list is pretty bland, and the low-level tether is pretty awful. (Maybe if you can can self-only spells on the tethered target?) The once per long rest banishment is decent at 10th. Making a Persuasion check against your own DC is a weird mechanic for the 14th level feature, and once per long rest usage even if you fail is really not fun.