I think the Pippen comparisons are rather off. His offensive game shows no similarity to Pippen's. Pippen had point guard skills in a slashing wing's body. Right now, it's anyone's guess what Batum's offensive game is going to be, but assuming point guard skills would be a huge stretch.
Defensively, there are similarities in terms of his defensive versatility, but even a rookie Pippen (who was older than Batum, to be fair) had a stronger frame. Also, Pippen not only had defensive versatility in his man defense, he had the (unique, IMO) all-court defensive ability to rove and disrupt, which came from a combination of instincts, athleticism and intelligence. Pippen was the only non-big man I've ever seen who had the ability to disrupt the team offense of opponents, not just lock down his own man. Batum shows signs of the man defense that Pippen had, but not the team defense and, again, it would be a huge stretch to project it as I haven't seen it from any perimeter player other than Pippen.
My upside projection for Batum is Gerald Wallace (he'll need to add muscle) and my mean expectation for him is Tayshaun Prince. At worst, I think he'll be Mickael Pietrus (the French nationality is coincidence!).