Well, for example she started the policy that British citizens can only obtain visas for their non-British spouses if they (the Brit) make above a certain income. Meaning that she effectively separated a lot of low-earning families, or forced Brits to move abroad so they could live with their spouse.
She's also applied some new criteria for permanent settlement retroactively - meaning that people who had been working in the UK in the justified belief that they were accruing rights towards permanent residence were just told one day that actually the rules had changed and they would not be eligible after all.
Lots of examples of UKBA treating students absolutely appallingly - a recent one was this American PhD student who applied for a post-study visa, and only informed of the outcome when UKBA showed up at his doorstep to arrest and deport him.
It's not great.
Chamomille is the way to go! 