[Edi]

I mean that with the BI mod, Ulm is a really brutal AI enemy, especially with difficult research and impossible AI. It has good troops and with the BI disabled ones, it concentrates on its better nationals, expands fast and will come at you with massive hordes of good quality stuff.

Ulm is not the most powerful nation magically, but depending on pretender pick and other things, it can be successful in MP.