I've come to think of Titans as the most overpowered class. They get really good perks, really good supers, and really good exotics. The difference with flashbangs is that they do as you said, blinding you. I admit to outgunning a few people while blinded simply because I've memorized natural strafing patterns, but I don't win often when blinded. The grenades that often one shot you outright are all sticky grenades, which titans also have. Except theirs explode larger, and twice making them superior. I guess this isn't the topic to be talking about class balance, but eh, it's bumping it either way.