Global is fairly easy to identify, and I do not think that any MLS team, or any of the other clubs mentioned outside a Dortmund, would be considered that. I don't think there are more than 10-14 that would consider themselves a global brand to be honest.
First class can be a bit more subjective. However, again, organization, structure, facilities, supporters, etc. would be the main attributes. And again, here teams from the MLS are not going to be "first class" in competing with teams elsewhere. LA has done some nice things, but in terms of how they would even compete with an Everton or Swansea, Ajax, Celtic, Benfica, etc. I think they've got a way to go.
Not to belittle semantics though, because I do agree that Seattle needs to be very ambitious in their next managerial appointment. Perhaps "first class" can be valued against other MLS teams. In that, Seattle must be near the top?