There's been a review of Siege posted at Discordia. It's in Swedish so you might need to use your favourite translation software to read it.
Just a paragraph (courtesy of google translate).
Siege is super easy to get started and have four basic steps that, in principle, constitute the entire game. Select the type for each role person / player (police, hostages or hostage takers), give the role the person some skills and flesh, playing out scenes in the adventure that affect the role of persons to one another and drives the plot forward and finally - give each role person an epilogue.
To be such a superduperenkelt games is Siege surprisingly playable. I suspect it has with the limited premise to do.