Though I agree that jumping up and down would be nice from everyone, please keep in mind that people react differently to gifts. I absolutely SUCK at receiving gifts. Meaning though I am excited and appreciative, I come off as more of an "ehh, thanks" when I really don't mean it. So whenever I get a gift, I exert extra effort to be all excited and happy, when I really don't feel it (again, not because I don't like the gifts, but just because I'm strange). So keep in mind that it's possible some of them are like me and really do appreciate it, and just aren't great at showing it.