Nope. You'd just end up with a massively rock-papers-scissors sandbox with most players using cookie-cutter templates despite the 'choice'. That and having to unlock stuff for multiplayer is anathema to skill-based gameplay.
On another note, I view Halo 3's multiplayer as a refinement of Halo 2's. After a while, they realised dual-wielding wasn't really working out and put more emphasis on the Battle Rifle, carried over the grenade balance changes they made in the first update and at least tried to make the sword not so utterly overpowered.
Halo 1 to Halo 2 was a revolution but Halo 2 to Halo 3 was evolution.
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