It lines up with 5e pretty well. Battle master could use a few more maneuvers, but overall well done.
Is it still the case that when you do a Maneuver, you are made to consume a Superiority Dice
before before knowing if the attack hits ?
If so, that's not a very good implementation to me. All the more so that the skeleton of the Fighter Class is overall pretty simple to implement (minimal use of Reaction). I'm not overly impressed by the facts that Second Wind and Action Surge are correctly implemented. The Maneuvers are the signature feature of the Battle Master Subclass. So if it's not done well, I wouldn't rate the Battle Master as done rather well.
I don't worry about the number of available Maneuvers. I'm sure more will come later. I'm worried about how the whole Maneuver system is implemented.
What is sad, if we sill lose Superiority Dice on missed attacks, is that it is not even necessary to have a proper reaction system (reaction with lower case r here, as I'm speaking about when the players' decisions are made, Maneuvers generally don't consume the 5E resource called Reaction). Indeed, with the current implementation, all the devs would have to do to get Maneuvers right is to consume a Superiority Dice when we select the Maneuver, and credit it back if the attack misses.
Of course, I'd be happy if Larian first implements a proper system for players to input last minute decisions, and then revises Maneuvers within that new framework.
