He was certainly a world class rally driver, but he only won one championship, whereas Hamilton has won 7 in his discipline, and no-one looks like coming close to him. Up there with Senna? Not even slightly.
In any case, the two disciplines could not be more removed, so there is little basis for comparison.
In addition to himself, McRae also killed three people, two of whom were childen, because he was showing off in a helicopter he was not licensed to pilot - if he hadn't done that, I'd be totally on board with a tribute for him, but he did, so fark him.