When I first moved to my MacBook Pro earlier this year, and started using Mail.app, it felt like I had moved from Outlook 2007 to Outlook Express.
I think I had Entourage installed for about a day, and much like you I was disgusted in the layout, the colours, and the overall chunkiness of the software. As for MyDay, it annoyed me.
Now, Mail.app is not the best email client I have ever used, and I do feel there could be a bit more development put into the application, but after all it is only really a email client, and as such should be treated that way.
I wish there was a bit more customization available through the interface and not through terminal, but then again, would we not just be restricting ourselves to the M$ way of things.
All in all, IMO Mail.app still beats Thunderbird.app and Entourage.
Nice post though, good for the noob OS X user, especially considering the price of Office:Mac.f2富二代官网入口