Just did a shroud on normal. We were really uncertain how good the group was, and played it safe. Turns out we one-rounded harry without breaking sweat. It'd be cool to have a very quick raid (relatively low rewards, of course - maybe twink gear, consumables or just a little renown and a 1 hour buff - certainly not good XP/min) to test raid strength.
A five-ten minute warm-up raid that's never on timer. Needn't be complex - a scalable version one of the dragon fights in Tor would be ideal. No clearing, no running around - just the arena bit. Would show group communication, DPS and be a little fun. Could make the arena and dragon type random to keep it interesting.

What do you think?