Wizard: You can turn every scroll into a spellbook spell, so go ahead and be that super-healer guy, even better than a cleric. Is this 5e rules or an oversight? Wish I knew.
Pets: Broken. Go send flights of re-summonable pets like your casters are aircraft carriers, keeping them way out of danger until everything is dead.
Rangers: Pet aircraft carriers, with crap martial skills. Good armor though. Good for unusual dialogue and environmental solutions, mine had like 8-9 skill proficiencies to start.
Fighters: Meh, same as they ever were, gear-dependent tanks. Self-heal is kind of dumb, so is rally, I guess 5e fighter is just basically a paladin now.
Rogues: Nice 2h fighter, better than the fighter. Good at chests and traps, pickpocketing, not much better at stealth than anyone else as it stands. Feels more like the OG rogue from old DnD than anything current.
Cleric: Worst class currently, maybe we'll need some major mass-heals later but it seems like there's a fair amount of off-heals from other sources, so maybe not? I think it would be nice not to need a healbot in every party, me, I always prefered the rogue + fighter genre fiction anyway (fafrd/mouser, Egil + Nix)
I have to say I don't love this system, and it's much more on 5e DnD than it is on Larian. That said, their surfaces-system and shove-fu doesn't mesh well with DnD at all IMO. Feels like two competing tactical systems instead of one oevrall balanced system.