Feels like they're deviating from the main plot from seasons 1 and 2. It went from this cool geeky guy show, to a show that feels like Friends.
And hey it's working for writers, they are much more popular now, but frankly it just doesn't cut it for me. Sure they still add scientific jokes here and there play their geeky roles, but the way the show is headed.. i don't know.. it's just not for me anymore.
Basically, it feels like they either ran out of ideas or sold out, or both for ratings & popularity. I'm glad to see I'm not the only one who notices the shift in the show. Show isn't as fun as it used to be.