Spam burst windows are satisfying when you turn them on and land things on a enemy target.
They work the same way as ultimate skills do in mobs games, you activate them by pressing "R" and you do cool and powerful stuff.
I love to play warrior for that exact reason, when im pulling wall to wall in dungeon and activate inner release i just smash mobs around me, dealing biggest DPS in the party, it feels great.
When SE reworked Warrior a little and made changes to IR it was taken really well and they are taking similar approach to other tanks too, which i like a lot.

More pew pew more fun.