The Tiberium Dawn ion cannon was highly useful - one shot would take out any SAM site (so long as it was open, ie send an orca over and fire when it gets ready to shoot).
The C&C3 one was definitely best, even if it didn't "leave a crater" (as though that's such a big deal - it only works if the building is completely destroyed, and most maps have plenty of room to build anyway).
I really liked the Nod defense structures in C&C3. Obviously the Obelisk owns in all circumstances, but I really liked the turret+control center placement idea.
The C&C3 one was definitely best, even if it didn't "leave a crater" (as though that's such a big deal - it only works if the building is completely destroyed, and most maps have plenty of room to build anyway).
I really liked the Nod defense structures in C&C3. Obviously the Obelisk owns in all circumstances, but I really liked the turret+control center placement idea.