EVERY player is expected to improve at least somewhat over time--if for no other reason than age and experience. A good coach (at least in terms of talent development) is able to see that players achieve or exceed their recruiting hype expectations. Although that is quite a subjective measure, anyone want to give a list of Hoya players meeting that criteria in the JTIII era?
First of all, not every coach improves every player. This is evident in the very fact that a bunch of Georgetown transfers did not improve when they got to other universities with other (some well regarded) coaches. It is simply unrealistic to expect every player to improve or meet recruiting expectations - if this was true, there wouldn't be a long line of people who were thought to be one-and-dones who aren't.
As far as recruiting rankings/hype, it is all subjective. Now, the recruiting staff clearly goes after players because they like what they see, and I am sure they use the rankings to some degree, if only as an easy way to filter players, decide who they are going to focus upon, etc. I also think fans tend to hype players way more than an objective observer might. For example, and I forgot who (but it's not a strawman guru, someone on HoyaTalk really said this), but someone said Campbell would be an NBA player after a few years. Now, he wasn't a top 100 recruit in any rankings, and I think nobody rational expected that, but at least one fan certainly did.
As far as your question, a short summary:
Roy Hibbert: Well exceeded recruiting expectations. According to RSCI, he wasn't a top 100 recruit. First round draft pick. Easy.
Jeff Green: Same, I don't see him on the RSCI top 100. Lotto pick. Exceeded expectations.
Greg Monroe: #6 on RSCI. 7th lotto pick. Matched or exceeded expectations.
Wallace: Not on RSCI, but a great guard. Exceeded expectations.
Henry Sims: #51 on RSCI. Didn't meet expectations initially, but he eventually made the NBA. I would say that lives up to his ranking, more or less.
Jason Clark: #62 on RSCI. Very good player for us, great shooter. I think he met expectations.
Austin Freeman: #14 on RSCI. Excellent college player, one of the best shooters JT3 has had. One could argue he didn't meet expectations being ranked that hard. Then again, nobody ranking his recruiting knew he had diabetes, either.
Chris Wright: #31 on RSCI. I would say Wright met expectations.
Hollis Thompson: #76 on RSCI. I think he easily met expectations. There are many guys ranked above him who never touched the NBA.
Nate Lubick: #42 on RSCI. Definitely did not meet expectations. But seeing him physically, I don't see how anybody could have thought he was of this qualtiy.
Markel Starks: #94 RSCI. I definitely think he played to a top 100 level.
Otto Porter: #34 RSCI. #3 lotto pick. I don't need to say more.
Hopkins: #98 RSCI. Performed lower than expectations.
Trawick: Not on RSCI. Performed up to expectations, I think.
Tyler Adams: #80 on RSCI. I wish we found out.
DSR: #37 on RSCI. Again, I think he met expectations. He was a very good college player who didn't have NBA skill.
Domingo. Not on RSCI. Didn't perform to any expectation.
Cameron: #75 on RSCI. Didn't meet expectation.
Copeland: #28 on RSCI. Performed okay freshman/sophomore year, well below expectation this year.
Paul White: #51 on RSCI. Too early to know given the transfer and injury.
LJ Peak: #62 on RSCI. Exceeded expectations (ESPN did have him at 31, but other services lower).
Campbell: No RSCI but hasn't met expectations regardless.
Derrickson: #93 on RSCI. I would say he's met or exceeded expectations. He's improved since freshman year.
Govan: #42 on RSCI. Similarly, I would say he's met expectations. Maybe you'd want to see a little more, but he's improved since freshman year.
Kaleb Johnson: No RSCI, but I think he's met the fairly modest expectations he had. If not, he's not far off.
So basically, we have a few guys who exceeded, a bunch of guys who met expectations, and a few who didn't meet their rankings: notably Copeland, Hopkins, Lubick.