Already cancelled, to test if it could be done by email. It can, but it takes two messages. The first one will tell you that you "must" call. They are bluffing.
Venture is a decent foray into the serious rewards card category, but a straight 2% with no category or threshold bonuses, and only a rare redemption bargain isn't good enough. There is a tradeoff in complexity and redemption flexibility, but Citi Premier's 2.66% reward for general spending seems better for those who don't want airline miles or hotel points.