Moyes got a lot out of us from 2002 to 2009 when we had a pretty weak squad
Yes, after that we didn't really break the glass ceiling when we probably could have done considering the squad we had (The first XI Moyes had in his last season for example was very good indeed, but lacked the mental aptitude to really succeed, which came in part from Moyes hitting a peak and not knowing how to go further combined with the fact that we were comparative paupers when matched against the top sides in the League), but we were comfortably over performing for the first 7 years or so of Moyes run.
We were a team who by rights should have been in the bottom half and he was getting regular top half finishes and getting us to the latter stages of cup competitions
Players like Arteta and Pienaar stood out even more in those days due to how weak overall our squad depth was. Just look at our bench for that 2009 Final for further proof of that