I don't think anyone thought we blew it up. The concern was/is that we didn't improve it, at least not through free agency, when we already weren't as good as the teams we need to beat to win a title.
We removed Cooper and Wilson at WR and added Washington and Tolbert. Anyone see that as an improvement?
We lost Gregory and added Fowler and Williams. No guaranteed improvement there.
We lost Collins and Williams and added Tyler Smith. Maybe an improvement at guard, but who knows at RT.
Other players who contributed to last year's defensive improvement are gone (Kazee, Urban, Neal) and we didn't really add FA replacements for them, depending instead primarily on players we had on the roster. Doesn't mean those players won't be improvements, just that there aren't any guarantees and in all probability, some will fail to come through for us.
A team that finished first in its division isn't going to blow up its roster, but a good GM is going to strategically add to it to try to improve enough to win more than just the division.