The 5 Taliban prisoners are all considered dangerous by any objective measure and it seems the evidence that Bergdahl deserted his post is very strong.
The administration has tried to make this seem like an obvious non-controversial thing to do.
Celebrating his release with a press conference with Bergdahl's parents. Something he didn't need to do. Then trotting Susan Rice out to say that Bowe Bergdahl served with honor and distinction.
Obama makes the point they we don't leave anyone behind. But that is not neccesarily true. If it's believed a soldier has deserted, there is no precedence for trading prisoners to get them released.
When Charles Jenkins deserted to North Korea in 1964, we did not try to win his release. He served 40 years in a North Korean prison. After he was released he was court marshalled and served 25 days in a military prison.
He said he couldn't notify congress because his health was in great danger. But to date there is no evidence of that.
On July 29th 2013, It was reported by ynetnews that the .U.S released the Taliban 5 as a gesture of goodwill without insisting Bergdahl get released. So that is where the thinking that the administration wanted these people released one way or another has come from. They reported that the .U.S released them under the condition that they promise not to engage in any more terrorism. The same conditions they had when they actually did release them.
The is also a concern that the administration is going to try to fix this investigation and make sure Bergdahl gets off easy so they don't look bad.