Those strikes are actualy my favourite. They are quite good. The Sand Palace has best boss fight in the game, because it's not some huge guy who 1hit kills you when you go close and where you just need to keep your distance and fire away with your sniper. You can actualy... melee and shotgun them! Also the level itself is very nice. Undying mind has loads of enemies to kill, it's so much fun to just jump in between them and shotgun them to hell! Defender Titan gets to really shine in the Undying Mind strike. The boss fight can be bit of annoying, but I enjoy it otherwise.