From EGM:"THE BAD: Timed missions revolving around getting treasure back to the hideout dont work in a stealth game."
Really stupid to put that in the game, now sure how big part of the game it takes. Gamespot review didn't mention it.
I did mention it, albeit in a factual rather than an evaluatory way, "Racing back to your hideout with a valuable urn adds more coins to your bank"
But the point of that paragraph was that collecting everything is really fun, both because there are tangible rewards and the act of discovery itself. So, I really enjoyed the timed missions.