A secondary weapon should never be more powerful than primary in FPS. Sure akimbo FMGs are only useful in CQC, but in a game where the maps are so small and tight they are just a constant pain in the arse for any players with any level of skill. The only thing more annoying than akimbo are those n00by arseholes running around with extra damage and range on Strikers.
I've changed my style of play to compensate for this, but now I've started receiving messages from the n00bs running around with akimbo FMGs and Strikers for being a n00by camper! You couldnt make this up!