A successful season? 23+ and/or less than 10 losses (I didn't count the # of games). One of the top 2-3 records in the MAC. Trip to MAC tourney finals. No off field troubles.
Now, if you ask me to define a great season, well that's different. That has some sweet non-conference wins, championships, and an NCAA tournament appearance.
I'll add that I like this approach too, because I've often thought for OUr program, we should expect to be able to go around 22-9 or 21-10 most years prior to tournament play. That's assuming 31 games.
I know this year, I'd expect 25-26 wins prior to conference tournament play. I think it can be assumed that winning the regular season MAC Title will take at least a 12-4 conference record based on years past.