[ziggus]

It's ok to send feedback, but understand that it's probably not going to change anything at the organization in question, except brand you as the 'Anti-Teams Crank'.

It's also perfectly ok to reject a position based on anything at all; the UCC suite they use is a perfectly reasonable reason, considering how much time you'll likely have to spend using it. Hell, I rejected an offer because the office was in an old building and the wooden floors creaked like mad.

However, given the weight of your opinions and the emotional response you have to an environment that doesn't suit your needs, have you thought about starting your own company?