Yes, if you need your computer to check email and visit websites, and maybe deal with digital photos and do a little light word processing, Linux is rock solid stable and more than up to the task. I can see my own mother being just fine with it for those purposes.
Conversely, if you need to roll some scientific HPC code, it's the preferred solution.
But God help you if you need to do multimedia desktop publishing or do Photoshop-level editing of photos or (in my case) do anything requiring a Common Access Card.