You haven't ever seen the bug list for some major software product. Try the Firefox bugzilla for starters, proceed to the Linux kernel, and if you aren't shocked enough to give up on computing, go on to notice that MS are just about to reach their 1.000.000th knowledge base article - and only comments, fixes and patches made available to the general public register there, their count of internal or unresolved bugs and requests will be at least a magnitude higher...

As OS2007 downloads from the same servers as 2008 (and hasn't even been mirrored), poor server bandwidth in particular is no reason to download 2007. And in terms of bugs, 2008 is generally a improvement, adding several missing features, while so far the number and impact of bugs is not that much higher than on 2007 latest.

Most issues posted here are not bugs, but install failures due to server overload (apparently resolved by now), errors due to installing 2007 backups over their new 2008 release, or in some cases installing from wrong (2007) files - if you don't do any of that, it is very solid.

But if there is nothing in 2008 which you need, it is not unwise to stay with 2007 for some more time - right now, many less popular software packages have not yet been ported, and the upgrade is inevitably lossy (recovering settings from backup is not recommended and known to cause problems across a 2007>2008 upgrade, so you'll have to configure from scratch). But in the long run, much stuff will be 2008 only...