Tapatalk is one of the most common, and seems to me to prove this point:
The mobile app you are being offered doesn't improve your experience as much as it does the app publisher's revenue. Apps will capture your data, contacts, and history on your mobile when better than your browser.
Apps will act as gateways for other apps, eventually leading to downloading something nasty without your knowledge, or masquerading as something benign.
Apps will force you into a mobile view, like it or not. Good for the site, bad when your mobile is a 10" tablet that shows you a fabulous desktop render.
I abandon them 100% of the time, so far.