Not sure where you perceive the inconsistency to be, but I'll try to help you understand.
1. Ewing was an unknown coaching commodity when he was hired, so there was no pre-existing opinion on his ability to coach or recruit. Same as Mullin, same as Juwan Howard, same as any other first-time coach. You can have an educated guess, and you can look at whether they surround themselves with professionals (Howard and Ewing yes, Mullin no), but then you have to see what happens.
2. Ewing's initial recruiting turned out to be problematic. He brought in some talented players, but he also brought in a fair number of problem children. It eventually blew up on him, with three of them departing involuntarily. Did Akinjo and McClung make the right decision in going places where they thought they would be better program fits? Maybe, maybe not. Kids sometimes make choices that are better for them in the short term but not in the long term. But clearly they were not happy at Georgetown - or Ewing was not happy with them - so they transferred. Bottom line there is that at that point in time, there was reason to be concerned about whether Ewing was going to be able to bring in good players with good attitudes who were a fit for what he wanted to do. And as we all know it's hard to win without players no matter how good a coach you are.
3. Despite the recruiting and management issues, it was pretty clear early on that Ewing was a very good strategist and game coach. Whether that's all him or him plus Louie Orr or whether it became more him as time went on, I don't know. But you could see that he came into every game with a solid game plan and then made good adjustments during the game to keep a team with a marginal roster competitive and to steal some wins in the process.
4. This season he had the worst roster in the Big East because of the departures. Notwithstanding that he won a half-dozen games and then managed to win 4 games in 4 days in the Big East Tournament, including wins over two NCAA tournament teams and a borderline Seton Hall team. Clearly some of it was getting hot and pieces falling into place at the right time, because nobody in their right mind could look at that roster and say "yeah, that's a 20 win team that should compete for a Big East title." Stuff happens sometimes.
5. Georgetown got waxed in the NCAA tournament by a PAC-12 team. The PAC-12 happens to be 9-1 in the tournament. Maybe it's just a better team from a better league and Georgetown wasn't able to sustain their BET magic carpet ride - certainly something that's happened many times to many teams over the years. Not sure that it says anything about Ewing's coaching ability. Again, stuff happens sometimes.
6. As for Wahab, it's difficult to see how he's going to be a more significant part of any team than he was for Georgetown, or what coach he's going to find who is going to do a better job of developing him. I guess we will see where he lands and what happens, but on its face it certainly does not seem like a great move by the kid.
7. As for Ewing, the remaining question is whether he can now bring in talented players who are not problem children. He certainly has a talented class coming in, and from what I can see it looks like he's learned from his past mistakes. If that's the case, they should be a top-tier team in the league again. I figured going into this season that even if he had a Norm-Roberts-eque disaster (which I expected given that roster) he would be safe for another year because he had that class coming in.
All transfers are not created equal, and I can't imagine that you think they are. Sometimes it's a good idea for a kid to transfer, and sometimes its a mistake. Go fight with someone else now.