I always want the opposition at full strengh and have done ever since 1977 when Australia came to England without Chappell and Lillee and the following year when we slaughtered Pakerlesstan.
I always tend to want every cricket team to play with its strongest possible combination, and never like to see either injuries or baffling selections. Partly because this leaves the "ah well we only lost because ... didn't play" crap open to anyone who wants a way around "we were second-best", but also partly because I'm more concerned for the game of cricket than any team.
However, if I was concerned only with victory for whoever I was supporting, the players I'd most want to see the back of at the current time...
Australia - Stuart Clark (not only is he probably their best bowler, he is the bowler who holds the attack together for mine, and you'd need three or four batsmen to be missing before the line-up was weakened all that much)
England - Michael Vaughan (for both good batting at number three and the fact that when he's absent there's headless-chicken effect in the captaincy)
India - Sachin Tendulkar (for the reasons Sangrah alluded to about both the calibre of batsmanship and the inspirational qualities - aside from the fact I think he's finally re-established the fact he's India's best batsman)
New Zealand - Jacob Oram (pretty much the only player currently available who I'd be really properly worried about taking a game away from us, with both bat and ball under the right circumstances)
Pakistan - Younis Khan (unquestionably the best batsman in the team for mine, and both seamers Shoaib Akhtar and Mohammad Asif are excluded as their international careers may be over with differing percentage chances)
South Africa - Jacques Kallis (really needs no explanation, far and away the best batsman AND a useful change seamer)
Sri Lanka - Muttiah Muralitharan (again, needs no explanation)
West Indies - Shivnarine Chanderpaul (ditto for the third time in a row)