With all respect, don't take this the wrong way, but I believe your opinion is influenced by your personal perceptions about Iga.
You forgot to mention that under his direction Castlevania had the best music ever. The RPG elements that made the most immersive games ever. The side quests and secrets that you just don't have in ClassicVanias. The map percentage, spells, habilities, alternate modes... and the most beautiful gothic designs I've seen in a game.
Also, I never saw a homosexual character, with perhaps only Isaac as an exception, but that's more a guess than a fact, not to mention there's nothing wrong with being gay.
About happy ends, need I remember that almost every VG in history have a happy ending? That said, I don't think Iga's ending were happier than other CV games. On the contrary, he used tragedy pretty often for his stories. What about Stella and Loretta's story in PoR? What about Soma's dark ending from AoS? And almost all endings from SotN? And the tragic story from LoI? It can't get sadder than that, it literally brought tears to my eyes. And the one you mentioned, from OoE. Really sad story. However, I DID expect something like that from Iga, except the difficulty. OoE is my 2nd favourite CV ever.
I really don't care about boys, I really dislike Eric Lecarde from Judgment for example, since I like men better. Men like Alucard, Leon and Juste. Those are from Iga. But also Julius was born under Iga's direction, and he is the ultimate CV macho. You also have Hammer. And I didn't see a schoolgirl, with the exception of Charlotte, the rest are just young women, or gothic lolis at most, but we had Maria when Iga still wasn't directing, and you can't get more kawaii and schoolgirl than that. That was CV and that wasn't Iga directing. Iga even made Maria grow up for his first game.
Iga IS the best producer, not only for CV. For anything.