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.
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.