Highschool DxD didn't click for me at first either. I watched all the way up until Rias got her Bishop and dropped it so that was about 5 episodes. I was bored later and and watched it again from the beginning and after episode 5 it got way better. At the point you're at it's not even a harem yet. The harem doesn't officially begin until about the end of the first season and then the beginning of the second season which is way better than the first (minus Gasper).i won't lie, two eps in and this high school dxd shyt is kinda wack. I'm guessing harem shows just aren't for me
If you don't like shows full of fukkery style comedy you'll probably never like it though.