Omega,
I wasn't happy with the out of the box experience either, I found it slow and lacking in horsepower. My girlfriend however is constantly amazed at what it can do.

The videos you are playing are perfect for desktop use, but maybe you should try recoding them to mobile/tablet/ipod type resolution - its better on your battery and its certainly more playable.

Theres a few things its missing and certainly lots of deficiencies and I'm personally working towards making it work how I expect it to.
Heres my approach: http://www.youtube.com/watch?v=iMXp0Dg_UaY

I didn't sit and complain in a forum though, part of the reason I bought this device was because it was open source.
It was created on the whole by people like you and me who wanted to make their computers do what they want it to.

Get stuck in, identify the problems, report on the bugs, try to help build a better device for everyone.

If you are unwilling to help then maybe geneven is right and you should pass yours onto a good home.