I never understood what people liked about Gmail. Seriously, why is it considered so great? I've had Yahoo! Mail for a long time, I write and receive emails and send small files occasionally, and it works fantastic for all of that. (Heck I still use Mail Classic, I refuse to upgrade that Outlook Express copy crap.) I haven't touched Gmail in three years or so, but I always found the way your emails were filed to be confusing, it was slow and not very pretty.
Only Google product I use and think is half decent is Chrome on my netbook, and I still have a lot of complaints about it. But it seems like it's the only simple yet customizable browser these days that isn't buggy and slow.