All the complaints you could level at Moore you can level at Tannehill. "Folds in 2nd half of games..etc"
You could say that Moore is still developing, and is much farther along than any college player is at this point. Moore has made more plays in NFL games than any prospect, shown the ability to make any and every throw and do it against NFL competition. You could say his mistakes have come from inexperience and that he can and will grow from these.
The negative way to look at it is that you feel he's reached the ceiling of his ability and makes his mistakes because he's just a natural loser. There is evidence that could support that but the evidence could also support the positive interpretation as well. This guy's already on your team, already under contract for a great price, and is ready to have his best year yet. Even if he falters, you can always pick from his replacement in next year's draft from a crop of candidates that is likely to trump this year's field. Plus, worse-case scenario, you could draft a guy like Kirk Cousins (who reminds me of Drew Brees) in the 3rd round and maybe he can start for you next year if Moore falters. Not only that, but if Garrard is healthy, he can really push Moore pretty hard so that whoever comes out of that competition will be a pretty damn competent NFL QB.