Game-Breaker: If you pick up Line Bomb combined with Infinite Bomb, you're in for a treat. If you're on the receiving end of it... not so much.
Good Bad Bugs: As shown in one of ProtonJon's streams, lagging out instead of removing the character from the game so the others can play normally will make you invincible.
Hype Backlash: Yes, actually! This was promoted as possibly being a new birth of the series. To say that didn't pan out would be an understatement.
Older Than They Think: The First-Person Bomber mode might have been inspired by the gameplay of the Japan-only title 3-D Bomberman, which was actually played in first-person view, unlike Act Zero's behind-the-player perspective.
Vindicated by History: A downplayed example; the game itself was, and still is pretty well hated. As a result, most refused to even touch the online multiplayer. Once ProtonJon started showing it off in his streams, however, many have come to admit that if nothing else, the online multiplayer is one of its few strong points, if not the only good thing about it outright.