I don't necessarily see this as him complaining about Americans lack of enthusiasm about foreign affairs, as much as him saying the truth that America is realizing that wars cost money it doesn't have.
Considering that he called limited congressional enthusiasm for a war in Syria "new isolationism," I'd say that he's not just pointing out a lack of enthusiasm for war, he's clearly criticizing that lack of enthusiasm.
True. But the House of Representatives comment is throwing me off. The right has hardly been embracing Hagel's planned reduction in force (Something that doesn't seem to be coming from pressure from outside-the-executive forces), and I'm unaware of the House GOP changing their position of "Cut everything EXCEPT the military" that they've had for decades.