Well finished up the 3rd season of Highschool DxD. REALLY hope it gets more, because I am pretty much officially addicted to this.
Yep. The main reason Aria isn't more well-known is the same one for pretty much every good series: it's not what appeals to the highly vocal lowest common denominator. Stateside at least, that's the haremshit pedo/cest battle arena wish fulfillment author insert trash that's popular with greasy basement-dwellers and younger teens.
...does this make me part of the problem?
But yeah, self reflection aside, I loved nearly everything about this show. The battles scratched my shonen loving itch so hard that its now raw and bloody, while the harem stuff was tempered by the protag actually being a decent guy who could reasonably attract women and not just a mary sue author insert. Not only that, but it could be gut-wrenchingly hilarious when it wanted to be.
And yes it of course had the obvious tits.
DO have a few complaints though.
1. Despite the protag's relationship with the girls evolving he never gets farther then he did in LITERALLY THE FIRST EPISODE. This is a problem because it just DESTROYS the suspension of disbelief and turns every ecchi segment into my brain screaming JUST FUCK ALREADY. TVtropes has informed me this is because of Executive Meddling however, so I'll forgive it while I write down a list of names.
2. The only relationship that felt like a total asspull, where the one girl who disliked the protag for his perverted ways instantly flipped to another haremmate after he helps her out one time. It MIGHT have been ok if it had been more gradual but nope, halfway through she insta-flips from thinking he is "the enemy of all women" to sleeping naked in his bed with all the other girls.
3. The protag's main ability is that he can double his power every ten seconds (it becomes more frequent later on and depending on his emotional state) so WHY IN THE FUCKING SHIT does he never ONCE start doing this before a fight begins? There was an ABSOLUTELY PERFECT opportunity for this too! There was a point where they were LITERALLY WAITING FOR THE BAD GUY TO BE UNSEALED. RIGHT NEXT TO HIM. WHYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY?