I really admire your aim for simplicity and your lightbox is pretty awesome, but I definitely agree with the others in how it's missing your identity and it feels empty without images especially at the top of the pages.
Here are a few things I would suggest:
- Make the menu fly in right away instead of a delay (or remove it all together)
- Try enabling featured images for pages and setting them as background header images
- Add thumbnails to the members page (people would like to see faces instead of just names
- Turn .btn-primary, @brand-primary, and links red.*
*I also suggest that you look into a LESS compiler if you're planning to recolor and expand Bootstrap. It's going the best decision you'll ever make as a developer and you'll definitely save a bunch of time in the long term.
I've also built a site with Bootstrap 2 and WordPress for my team if you need some inspiration:
http://iliterobotics.org/