I didn't come to this decision because of the unskippable cut scenes.
While I still disagree with SE's solution to players rushing the 8 player MSQ dungeons, I can tolerate them if the rest community wishes to as well.

It's the roulette EXP bonus for Castrum in particular.
While only 15 minutes shorter then Praetorium, the EXP is only around 55-60% of what you earn from the latter.

Combine that with the terribly paced cutscenes(That can potentially be detrimental to the party's survival), and the far greater awareness required (While not especially difficult, wipes can definetly occur unlike in Prae), Castrum is quite dreadful to run.

On a familiar note, almost all of toxic behavior I've witnessed since the MSQ change has occurred in Castrum as opposed to the Praetorium.
It could of course merely be a coincidence, but perhaps I'm not the only who can currently handle Prae; yet hates Castrum?