This show is being edited creatively as is every other "reality" show on MTV....I'd bet my fuzzy bunny on it.
1. The retreat being "sprung" on the house pledges. We are given no timeline between the meeting where the non-house pledge said "this house sucks!" and the retreat. For all we know, there was a 2-3 week notice to the house pledges that this would be happening. I know even in a small group, a retreat takes a lot of planning. They didn't announce it one day and have it the next. Come on, that's just not realistic.
2. The Sigmas being "un-fun." I think it's more that they probably went to the bars or restaurants where MTV was not allowed to film (and they knew it). They know that even if you have one beer, MTV will use it to promote the "sorority = alcohol" image.
I have no problem with Jordan and Candace going to the bar...I have a HUGE problem if they left a retreat to do it. If you can't give a weekend of your life for a sisterhood retreat, you shouldn't even be pledging. It just confirms that J & C are only there for the cameras.