I'm generally a big fan of Google (note my profile :D) and am overall very excited about and pleased with the new AdSense program.
However, I must respectfully note that I'm shaking my head at a few commonsense things that Google has surprisingly overlooked.
1) Missing subdomain
I realize that Google folks might have faced some difficulties in purchasing the adsense.com domain, but why wouldn't they have thought to set up [adsense.google.com...] (since there's the precedent of news.google.com, labs.google.com, etc.) Heck, even AdWords has its own subdomain ;-)
2) Lack of informative error pages
Try going to [adsense.google.com ]. Pretty ugly, huh? You'd think that a company staffed with so many brilliant programmers could at least have non-existent subdomains default to google.com ;-). Sadly, Google's other error pages don't fare much better. Try [google.com ]. Given Google's brilliant and much-appreciated abilities in politely suggesting alternate searches to spelling-challenged individuals, could it be that hard to make educated guesses about its own pages ("Did you mean: Adsense"?)? Or, failing that, how about a more useful error page, including links to key google sections?
3) Lack of polish
Overall, even with few options (reporting and otherwise), the AdSense doesn't seem to enjoy the simple elegance of the rest of Google's interface. And [url=https://www.google.com/adsense/reports-payment]some pages[/url] scroll off the side horizontally on IE 6.0 even at 1240x1024 resolution.
While I've urged patience to others criticizing the current incarnation of AdSense, I do have to admit that I've at least somewhat re-evaluated my stance. Given Google's well-deserved reputation for excellence, I think they should have at least admitted that this is still in "Late beta" stages, or version 0.8 or something like that. I know I'd be wringing my hands if they made most of us wait before having the pleasure of trying out the service, but at the same time, I think it seems a bit overreaching to call this 1.0. It'd be 2.0 or 3.0 in MS-land, but Google... well, I expect better for even a version 1 :)