Nardpuncher
Rear Admiral
If Sulu hadn't forgotten to disengage the inertial dampeners or whatever, then the Enterprise would've arrived at Vulcan the same time as the rest of the Federation ships and likely been destroyed also....since it was only the fact that Nero had the time to read the name of the ship that he delayed his attack, something that he wouldn't have done in the midst of a large battle.
So Sulu saved the ship and possibly the Federation!
So Sulu saved the ship and possibly the Federation!