I don't particularly care for them myself. I can understand the logic for the militaries who have adopted them. If a soldier has to clear a building with a standard infantry weapon, then by all means, make that weapon as maneuverable as possible. Bullpup configurations do just that. The problem is that you're still firing a rifle round, and that means a higher risk of collateral damage. Whether it's due to budget constraints, or the need to keep weight down, it's a trade off.
Personally, if I were clearing a building and had the option to choose my weapon, I'm going with a H&K UMP45. There's a much lower risk of overpenetration, it's an extremely effective round, and being subsonic, there's no need to reduce the powder charge when using a suppressor.
Plus, I think bullpups are ugly as sin!
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