What about him?
The top 4 that year were Lebron James, Darko, Carmelo Anthony and Chris Bosh... 3 of the top 4 were All Stars. If all GMs were good at evaluating talent, #5 Dwyane Wade would have been in the top 4 and Darko would have come much later. Some GMs aren't, though.
But I didn't say that all top-4 picks every year were All Stars, which they obviously aren't... just that in the top 4 there will be at least one All Star. In the year you mentioned, for example, the top 5 picks were 80% All Stars, the bottom 53 picks were 5.6% All Stars. If you've got a top pick, even in a terrible draft year, you have the opportunity to pick a future AS. Or Geoff can pick the next Darko, if he's that bad at evaluating players.
If you're going on the assumption that Geoff is an idiot who picks players using a dartboard, then you may not care much about where we end up in the draft. Otherwise, you want him to pick first.
Between the 1980-2005 drafts (I didn't go later since the jury's still out on '06-'08), if you had the #1 pick, your chances of getting an All Star with it were 21/26, or 80.8%. This drops off very rapidly, the 2nd pick was an AS 8/26 of the time (30.8%), but by the 6th pick it was only 4/26 (15.4%), and so on. The best players go fast.
Darko only matters if Geoff is doomed to blunder horribly.