The double click needed to perform heavy blow, weapons stuck in walls all the time, extremely slow move recovery times (one light attack and the character takes about second to be able to perform next action)...
EDIT: completely unrelated to combat but...
Anyone else gets sluttering from time to time randomly? The game runs at steady 60 fps, but has severe slowdowns from time to time.
If you're using mouse and keyboard I suggest getting an AHK script that binds the in-game key attacks to your mouse buttons, and that's for two reasons:
a) if you're using default mouse keys for attacks in-game, there will be a small delay from when you press the mouse button to when the attack executes. If you for example use the alternative/keyboard setup to attack, you'll notice no delay, thus you get an AHK script to bind those keys to mouse keys (yeah, silly port)
b) you can bind heavy blows to Rmouse button and left attacks/blocks to mouse 3/4 button so you don't have to double click
Weapons stuck in walls, extremely slow recovery times (although related to weapon type) - that's just how the combat system is, and it's hilarious how more realistic than Warband it is in this regard (whilst in Warband you can swing a 2H like nothing through walls). This makes the combat more difficult, which is good, you can't just mindlessly spam, you need to think through each swing.