It's not terrible , just not exciting or interesting . Kinda boring and all over the place with multiple animes and game characters in one world despite being reborn in dxd
I think, it's actually great for dxd being crossover with many different stuff, in first it's already a crossover as it is.... Though, it's more about who write then what he used.
I just feel like the point got filtered out long ago, the powers and training he has are already enouph to destroy everything, then there was that whole summoning thing and even by chapter 20 he is still before canon plot.... I no longer know how to feel about this...