A majority of them are too small to be felt, but we have had 5.9's and 4.0's before. Even a 3.5 can easily be felt if the epicenter is close enough (of which, my house is only about 3-4 miles away from the epicenter of quite a few of them).
The big deal is that it's starting to damage buildings. My house is developing a few cracks here and there, and some people are even getting serious enough as to having some foundational issues.
When did it all start? When they started fracking. When did it stop? When they paused fracking for a while. When did it start up again? When they started fracking again.
I know correlation does not equal causation but damn if that doesn't provide at least some necessitation to investigate.