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If the players are "openly boasting" it sounds like they're having fun. If they start actually complaining that they're bored I guess that would be a sign to pump up the challenge.
Charging in headfirst is the most enjoyable style of play for a lot of folks. If their style of having fun annoys you I guess you could take some steps to make it more dangerous. Using monsters with reach (possibly via reach weapons) and Combat Reflexes should make aggressive tactics more dangerous. If the PCs like to actually use the charge action you could have enemies carrying weapons which can be braced against a charge for double damage. I'd point out that the enemies are bracing their weapons since that only seems fair (or at least offer a Perception check to notice), but whether you want to mention that they'll do double damage if they hit really seems like a matter of taste to me.
As far as not fighting everything they meet, perhaps you could have a few NPCs talk to the PCs and offer them hidden treasures, quests with rewards, etc. If the PCs are literally killing every NPC before he or she can get a word in edgewise you could try putting an NPC in a somewhat safe area like a room with a door which has only a small opening the PCs can hear the NPC through. Such bloodthirsty PCs might also be in danger of killing good, innocent, and or socially significant NPCs without bothering to listen to who they are first.