Enlarge Person and Reach Weapons

You've found one of the stronger features of the enlarge spell. Unless the DM uses the cramped conditions out of the DMG2, or simply limits where you can take the now 16' to 20' polearm, the enlarged combatant with a reach weapon really dominates.

...Since a Huge benefit of reach is that a foe has to threaten you to take an AoO on you.

With a reach weapon, You can sunder and disarm without worry of AoO if you foe does not have equal reach. Such as the glaive weilder below could do to the samurai

If you are using natural reach, you can trip, unarmed strike, and attempt to start a grapple without drawing an AoO if the foe does not have equal reach. The marilith below could choose to do these to the unfotunate samurai without giving him a chance to take an AoO.

There are no rules granting the foe the chance to strike you or your weapon as you take advantage of your reach. I would not blame any DM who said the defender could do so, since you are sticking you or your weapon in harm's way.

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