Don't get me wrong. It's nice that they added anything during this long content drought, but I'm already kind of over it.
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Then don't play it? It's the first piece of legitimately new content we've gotten in years. No tired old "Kill specific enemy to get special buff, wear down bullet sponge for 5 minutes until they immune, repeat until done" crap and no over-use of champions. The towers add a sense of improvement to your run, the champions aren't overdone or over-tuned, they give you a good mix of power fantasy and difficulty (power fantasy in general waves, difficult in boss rooms), and they're the perfect place to test how effective a build will be in actual use. Yeah, it's repetitive, because you spend 5 waves just killing hordes of enemies, then a miniboss, another 5 killing hordes, then a big boss, and you do those two cycles 10 times each. But if you don't like it, then the mode wasn't made for you. So don't play it. Go play content you do enjoy. If you don't enjoy any of it, then stop playing the game until they add more. This isn't rocket science.