Can you build a good platform game in Scratch 2.0? Yes you can!
I am building a platform game myself (see example, watch gameplaye here). While I'm building it I discover and invent new programming techniques that improve the game. I'd like to share this knowledge so I made a tutorial where I describe these techniques.
It's not finished yet but more lessons will follow soon.
Update (march 27, 2013): added lesson 3.
Have fun!
Thanks