As a kickstarter backer that didn't follow the development at all, I am very pleased with the final result.
I got convince by the dismemberment it offered but as good package as a whole. And with a reasonable price tag.

I mostly play frontline, basically a 32vs32 team deathmatch with objectives. And it is super fun. The customisation of the characters and classes you can use is sublime, The sound is glorious. And the overall feeling of the game is superior.
Since the For Honour flop and the death of Chivalry and War of the Roses, there wasn't a medieval FPS beside the single player-only Kingdom Come Deliverance. And Mordhau comes to take that niche and it does it brilliantly.

Bad things[/] - only five maps, not very large, and a couple of them a bit unbalance. We hope there are more content coming. First few days the servers struggled with the game success. Much better now.

Good things - the rest. The combat is complex enough to keep it fresh, fighting styles have to be adapted to your armour, weapons and your opponent's. Horses feel powerful like no other medieval game have managed to do. Class customisation is great, and so far, no microtransactions or stuff like that.

A bit of fun below:
https://www.youtube.com/watch?v=0PvBsn3cRRQ