Quote Originally Posted by JNAProductions View Post
MORE THAN ONE size category larger.

You can, as a medium person, grapple a large ogre. You cannot grapple the Tarrasque, for instance.

Again, that's an aspect I don't like. If it ever came up in one of my games, I'd adjust it (with advantage and disadvantage as appropriate) but it's RAW.
Hmm don't have my book on me, but the online sources agree with you.