I'm late to the party with the ADR news - but this gif sums up ADR's WWE career pretty well.
Honestly, assuming this all isn't a work of some sort, I think the collective loss of 3MB was a bigger loss than ADR. At least 3MB could get reactions from a crowd once and a while.
Del Rio constantly kept getting shoved into the WWE/WHC picture despite nobody giving a shit about him whether he was face or heel. The only thing that got him remotely over was Ricardo as his ring announcer. The biggest pop ADR was ever involved in that I saw was when Ziggler cashed in MITB against him (and I think that audience was just collectively happy that Zigger was cashing in and ADR was going to not have the belt). The guy may have been a good worker, but that's really about it. Everything else about him was pretty sub-par.