I loved Jetpack. The convenience of having all those features in one plug-in was fantastic. I also loved checking the stats everyday. Unlike Google Analytics, it was so easy to tell who was linking to my site each new day.
But yesterday, even my tiny blog received too many visitors (probably ~20 at one time) and the server response time shot up. I had an average load time of about 35 seconds, if the page loaded at all. It was a disaster.
A quick analysis by W3 Total Cache pointed out the offending plug-in: Jetpack.
Now that I've uninstalled, I'll have to find other, more stable plug-ins for site stats, subscriptions, sharing, and who knows what else.