I don't really understand all the hate
If you don't like it fine, no one is forcing you to use it. Obviously there is a market for this so people are using it.
I only have a MBP so I've never used the magic trackpad, but I use a mouse with my MBP and will use the trackpad AND a mouse during the course of a given work session. That said, I can see where having the magic trackpad and a mouse on a desktop would become a space issue, especially if both are to the right. And putting the trackpad in front doesn't work because it gets in the way because it doesn't lay flat. So this solves that space issue in a decent way.
I only have a MBP so I've never used the magic trackpad, but I use a mouse with my MBP and will use the trackpad AND a mouse during the course of a given work session. That said, I can see where having the magic trackpad and a mouse on a desktop would become a space issue, especially if both are to the right. And putting the trackpad in front doesn't work because it gets in the way because it doesn't lay flat. So this solves that space issue in a decent way.