Just one soldier released in exchange for 5 hardcore terrorists. These terrorists in turn will kill many more American soldiers. Bergdahl wasn't even a high ranking officer to begin with.
Yeah this was a really stupid decision. It also signals to them that our government will trade prisoners with them which makes kidnappings and hostage taking much more likely.
We can keep our soldiers safe by keeping them at home instead of in so many countries. We could also save a ton of money that way.