Dont embarrass yourself by comparing him to those hacks - Oz won 3/4 test matches with him in the side and he'd bring much needed consistency
Teams can win series carrying weak links in a side like McDonald was in all of test he played for AUS. Perfect example of this was the 2001 Ashes, with AUS basically carrying Brett Lee throughout that series when the better option in Damien Fleming should have been picked.
McDonald is comparable to all those English hacks in the sense that none of them are good enough @ test level as all-rounders. Although i did acknowledge i think he is better than most of them (comparable to Capel only).
The only reason McDonald was able to keep it tight in SA, was because of how superb Johnson/Hifly/Siddle bowled in the 1st two test. Especially Johnson who shocked them with amount of inswing he got in SA - they certainly wouldn't have expected that based on what they faced from him in AUS. The SA batsmen where never in a position to be able to take of advantage of McDonald since he was an obvious weaklink, until the final test @ Capetown when they got accustomed to the AUS pace trio on flat pitch & absolutely slaughtered McDonald.
After Bollinger got injured, Nannes should have been called up & would have certainly been more destructive as part of a 4-man pace attack in those SA conditions.
While on his debut although his bowlinG was commendable. Giving AUS the 5-man attack that was lacking in Perth & MCG tests (given the selectors made the poor choice of picking Krejza & Haurtiz as part of 4-man attacks during the 1st two tests). His batting was never good enough to play @ # 6, so he made the balance of the side poor.
Thankfully in that SCG test & series except for Hayden & Hussey all the AUS batsmen handled the SA bowlers well. Johnson finally got bowling support with Siddle steeping up . Thus they all played well enough to cover for the deficiences McDonald brought to the team balance in that test.