Michael Sheen had the mannerisms more or less right, but he didn'tlook like Williams and he wasn't funny. The real Williams was weird and anarchic, bordering on dangerous; Sheen's Williams was merely annoying.
There have been a lot of these shows recently. The best of them was the Life and Death of Peter Sellers. We seem to have an appetite for crucifing clowns. How dare you make us laugh, you freak! Now cry- go on- cry!