Theres two ways to look at Gilchrist. If you were to look at just the period where he dominated poor bowling attacks across the globe better than a lot of players, you could call him a 'genius'. However, if you consider that he played better quality bowling towards the end of his career than the start you would consider him to not be near as good. I believe in the latter while you believe in the former.
IMHO, his record in India during his prime years, is a far cry from his overall career record. During his time, this was probably the best attack that he played and he was far from successful in both series. And if it werent for this inning in Sl:
http://howstat.com.au/cricket/Statistics/Matches/MatchScorecard.asp?MatchCode=1706
his record there would have been even worse.
The real icing on the cake though was the Ashes in 2005, as I think its fairly obvious that he was worked out and just didnt suddenly go downhill when bowlers started to go around the wicket to him.
Theres a reason why Gilly's domestic record is worse than his international record and thats because he achieved more than he should have.