Does a 1,000% gain make a hedge fund manager a genius or a contrary indicator?

From the FT: A Californian hedge fund has made more than 1,000 per cent return this year by betting against US subprime home loans, making it one of the world’s best-performing funds of all time. Lahde Capital, set up in Santa Monica last year by Andrew Lahde, last week passed the 1,000 per cent mark, [...]