These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Ghost Sweeper Mikami
Arc Fatigue: The whole Ashtaroth saga takes forever, with a lot of lame plot twists.
Ensemble Darkhorse: Luciola. Being Yokoshima's first real love—as in, not the primarily-lust he held towards Mikami—helps a lot, it seems.
For that matter, Yokoshima himself.
Growing the Beard OR Jumping the Shark: After Yokoshima entered the GS Tournament and won his own spirituals Abilities, the series changes a lot. The style changes, giving more screen time to battles and less to Gag and Ecchi. Also, it starts focusing a lot on Yokoshima who stops only being the series Butt Monkey to develop into the series God-Mode Sue and Butt Monkey (both at the same time).