Originally posted by Darth Faunus
Erm, Kit defeated two MagnaGuards simultaneously in LOE. With a style that., might I add, has awed even Obi-Wan and Mace. So much for 'owned'. Although the trio may end up losing anyway.
What you have to remember is that Kit's fight with the Magnaguards took place on top of a speeding monorail train. The Magnaguards had to magnetise their feet to avoid getting blown off, so their mobility was seriously impaired. Kit had no such problem. On stable ground, he wouldn't have quite such an easy time.
Obi-Wan had some problems with an IG-100 in ROTS. Grievous uses a fighting style that is unpredictable and only the most experience Jedi (which would basically be Obi-Wan for he already battled 2 Siths) could take on 2 of them say Kit and Agen. The other IG-100s team up on Tiin and either kill him or wait for Grievous to get done with his Jedi killing.
Grievous doesn't rely mainly on fear for his movements are hard to predict and he can slice down any Jedi expect the strongest of them with ease.
That's speculation, Avis, and unsupported speculation. Based on what we saw on the Invisible Hand, Obi-wan and Anakin rather easily pwned the guards. They weren't in any real danger. Why would a few more suddenly spell doom? And remember that Obi-Wan is a Force user and they are not. He can push them back, jump up high, etc.