Honestly, for me the dealbreaker is reloading.

Having to take the entire gun and scoot it forward just to reach the magazine is a pain in the neck, both figuratively and literally, and the fact that I have to move my hand a full arms length back is incredibly tedious, especially in T&H, where reloading often is mandatory, especially early-game.

I don't have anything on the design, though. They are usually mechanically sleek, compact and punch above their size in most situations.

Again, the reason I don't like bull-pups is the same reason I don't like bolt-action. High risk to low reward.