I own a Mini 2 and use it all the time for web browsing and email. I have a preference for physical keyboards if typing a lot of text, but otherwise works great. I am going to keep my Mini 2 when I get my iPad Pro.
I was using a Mini 2 until a couple of weeks ago when I splurged on a Mini 4. For those purposes, the only potential issue might be more Safari page reloads on the Mini 2 than the Mini 4 due to the 1GB vs 2GB of RAM difference. You shouldn't see that unless you keep quite a few tabs open, and even then it might not be bothersome.