Crits is not added damage though, they are fundamentally different.

I have to admit I have been having fun playing with a demon assasin teamate as QoT. ( since everyone is playing DA it seems, and note: fun doesn't mean viable, we don't know enough yet about DA since we are all inexperienced with him)

But...

Shielding really allows the gank follow up as he goes in with the warp strike behind the towers on a spiked enemy. 

Also, since the QoT Spike / Idol build is awesome at taking down towers, I'll take down a side tower nobody cares about and marvel later when the smart DA's use the gap as an escape path after warp striking behind enemy lines for a kill, instead of trying to run back through the frontal towers. It's neat seeing them skulk off after the kill in a different direction.

ya I was thinkin DA rook is a sick combo as well   Just pulllll someone into all those towers, stun, slam.. dead ftw.  I mean, you knew they wanted to walk into all of those towers.. but just needed a little motivation.  They were scared or somethin.. should never be scared of dying

Also, DA does have an interrupt - Shadow Swap.  You trade places with them and interrupt them in the process.  Just be careful about "interrupting" teleport lol.  You can definitely swap someone and end up at their citadel.  This happened to me but luckily he was only porting to the gold mines lol.