McGrath is the best pace bowler in the world by a long way, Gillespie is in the top three or four if he isn't second outright.
Gillespie is a match for the likes of Roberts and Croft, but probably behind the likes of Holding, Marshall and Garner.
Gilchrist is the best keeper in the world, or very close to it. If he's not, who is?
Ponting is not as consistent as Dravid and tends to struggle a bit against spin on tricky pitches. He is a better player in some conditions than Dravid as well, although the gap is not as big, and he's a far better one day batsman. Overall Dravid is slightly ahead, but not by a long way.
The West Indies side of the 1980s are pretty closely matched to the current Australian side (or the Australian side of 2001/02) in my view. If I had to choose one I'd probably lean very slightly towards the Australians because of the Warne/Gilchrist factor, but there's not a huge gap.
All of them are arguable, but none of them are ridiculous claims at all.