I like Souness as a pundit too for the same reason I like most of Sky's pundits, they're all interesting except maybe Redknapp.
Hansen used to be ok in that sense (despite being a tit) but these days he seems as sedated as his colleagues at the BBC. Biggest collection of dullards I've ever seen. Keown is pretty good, he can do better.
BT are the worst of the lot though, look like they've got out of their way to hire the few ex pro's who probably don't watch any football in their spare time. They're all flakey as hell too.