Tampa is the only team in the division where the injury troubles are bad and not a surprise. Boston's only real loss is Victorino, who missed 40 games last season and 30 two years ago and is getting up there in age. I don't think its a major surprise he is injured, it's more of a surprise the Red Sox lost Ellsbury and did nothing else to add to the outfield. Then they have Middlebrooks, who has been awful since his rookie season and may have actually been addition by subtraction (giving Holt playing time who has been very good). And then Lavarnway, who was their 3rd string catcher. Nothing unexpected happened, their team simply hasn't played good.
Teixiera and Pineda getting injured is no surprised. Beltran was also a risk. Other than that their major injuries include Sabathia (once again, OLD, weight problem, not very good anyway), Cervelli (back up catcher), and Nova (not very good). They're lucky guys like Jeter, Roberts, Ellsbury and the rest of their aging players didn't get injured. Maybe nobody saw 4/5 of their starting rotation going down, but I don't think the number of games lost is remotely surprising considering their roster, if anything it could be higher. Losing Tanaka is killer, but that just occurred. The Yankees problem hasn't really been injuries. Both their offense and SP just isn't good. That is true with their original rotation. Sabathia and Nova were awful and Kuroda isn't the same. Now, without Tanaka, they're just awful.
For the Jays their only major injuries have been an awful 2B and a SP made of glass. Not much lost with Izturis and almost expected with Morrow. They have most likely been the luckiest team in the league by far with players vastly over performing anyhow.
The Rays have been unlucky but I think you could see this coming with Victorino and NY and TOR's injuries. It's better not to have an average age near 35 and not to rely on players that constantly get injured.