I don't really dislike this matchmaking all that much. They clearly want to try and fast-track Despaigne a bit and I think with the loss to de Lima and the stinker against Arlovski, Waldo has lost whatever favor he once held with the matchmakers. They thought they were bringing in some heavy-handed Dominican boxer/slugger-turned-MMA-knockout-artist... what they got was a fairly middling and one-dimensional dude who likes to posture and jab his way to greasy Decisions against low-level guys. I don't like matching up prospects who are undefeated in the promotion unnecessarily, but Waldo has shown he isn't really that IMO. He has struggled against pretty much every opponent and already taken a loss. I'm not holding my breath about Despaigne, but might as well see what he's made of.
As far as the match-up is concerned, I guess I'll favor Robelis. I still have a lot of questions about his overall MMA game... but I don't think Waldo is really the guy to meaningfully test him. He is legitimately just a boxer playing at MMA... he has a very serviceable jab that he sometimes doesn't use enough and he has decent power in his hands but really nothing to write home about. Dude loads up on his shots like crazy, too. He has only attempted one takedown in all six of his fights under the UFC banner and didn't complete it. He has steadily adopted more kicks -- including low kicks -- into his game since getting beaten up by them early on, but that's not really his forte.
I don't really see any reason Robelis can't use his superior physicality, speed, power, and reach to beat Acosta at his own game. I'll be interested to see if Robelis has any sort of low kicks in his arsenal, as Acosta has been shown to be incredibly vulnerable to that weapon... but even if Despaigne doesn't go that route he can probably just punch and head kick his way to victory. Waldo's chin has held up in his UFC outings thus far, but he's really only faced one legitimate power-puncher and de Lima was more concerned with managing the fight to a clean Decision win than trying to put him out. The Dominican has been finished multiple times during his boxing career, so Robelis can probably do the same. Short of Robelis inexplicably gassing out, getting clipped by a wild shot, or Acosta going out and fighting in some way he's never fought before (i.e. lots of grappling and low kicks) then I expect another showcase victory for the Cuban.
All this being said... I think Buday, Gaziev, or Pogues might have been better if they're legitimately trying to test Robelis.