For one, executioner would give you a Dex-based MBA for free.
Unless you have a warlord in the party with lots of "everybody gets an MBA" powers, I don't see how that matters. You lose a number of class features when hybriding, you had better make sure the trade is worth it.
"I would really like to see a game made by Obryn, Kurald Galain, and Knaight from these forums. I'm not joking one bit. I would buy the hell out of that." -- ChubbyRain