classes that I don't particularly care for are the Arbalest (like what the hell does this thing even do?) and the Highwayman who starts off really nice but scales pretty poorly I believe.
Arbalest is arguably the best single target damage in the game, up there with Hellion, throw in an Occultist/Hound Master/Bounty Hunter to mark for them and they're pretty good. I think the Highwayman scales fine if you build him for ranged, throw him in around slot 3, seems to work well, especially if you get that ranged orange trinket for him.
I quite like all the classes, while there isnt a ton of different skills most have at least two viable builds and I found that sometimes switching those "builds" around made me like classes I used to think were a bit shite. Grave Digger is probably the only class I dont particularly like, all the other ones have a nice "feel" to them, or little mechanical combos or what have you. The Grave Digger always feels boring to me.
Hellion is probably my favourite class, I like how they look and how they play. Warmed up to the Abomination a lot as well. And who doesnt love the Man At Arms?
2) Most monster engagements don't require dynamic tactics. While the Cove does offer some variety in how monster parties should be approached, for the most part, stun/DPS is the go-to approach, which leads to battles becoming grindy and repetitive.
Used to use a stun heavy approach but honestly these days I feels its sub-par, apart from needlessly elongating battles the "return" on landing a stun is often much worse than the return on straight up damage/dot's