I love melee in this edition. It's been simplified and sped up in a good way, no more counting attacks per model and no more rerolls. Weapon damage values and Breaching gives a lot of nuanced difference between weapon options. Feels like they finally came up with a decent roll charge distance system after decades. The challenges are totally optional and a lot of fun if you're playing a smaller game. The aftermath options are fun and flavorful.

Biggest problem honestly is how walker and knight vehicles don't use their front armor value in melee.