Again, my main grip is how superior Oga is during most of the fights. He has defeated elites with a single punch, like that boxing guy.
Yes, he hast lost a few matches here and there, but after a few chapters, he got his revenge.
So while I really liked some of the fighting (Giant Baby Beel vs that huge demon was great, and the fights vs Toujou are always welcomed, if only for the badassery in display), the stuff I really like is the goofier stuff, like the video-games arc. That was golden.