To do any work using AdWords and Google Apps and Google Analytics, and Webmaster Tools I end up using three accounts and two browsers.
If Google did Platforms, then the first one to fix is "who the F* am I?" (Authentication and Access Control) and make it get used everywhere.
Hell, Google can't even work out what to name things. So you get scammers exploiting Google.com naming to convince marks that the scammer really works for Google. This is also a Platform issue - Google.com should be for Google stuff - not abusable to allow, for example, spoofing a search results page so you can claim that Google has given you special access to modify search results (one SEO scam that I keep encountering). Non-Google stuff should be on an identifiable domain, which will eventually permeate user consciousness as being "not Google content".
I speak as a pure outsider and consumer of Google stuff. But I'm sufficiently vexed by Google Apps/Accounts/Profiles to want to lose the paid for services as much and as soon as possible. I get better (or no worse) treated when I don't buy. :)
And Stephen's point about Google arrogance - yes, I think Google is arrogant. I was an AdWords Help Forum Top Contributor until Google decided that small businesses should only receive AdWords support from other users, not Google. That's seriously annoying. I stopped contributing when it became clear that Google thought small businesses should be denied any customer service - you really can't have third parties answering questions about why Google isn't accepting a specific credit card, or even why a specific disapproval has been given in an account you can't see. That was pure arrogance - dumping on volunteers and crapping on small businesses. I'm told it's different now but I still have such a bad taste in my mouth from the experience I don't want to get involved again. Google can be arrogant, 100%.