I think Ferrari might be legit this year. I'd love to see Sainz win some races.
I've been subscribed to F1TV for 2 years now and am a big fan, however its not without issues. I had one race I had to switch to Bluecurve for, because it kept buffering every couple minutes. But the amount of races I watch live are pretty low. For replays and watching the various before and after shows, it's super convenient. Plus being able to watch the archives is great. They also really improved their AppleTV app last season, and it's a great option. I typically watch via the website on my laptop, but like having the AppleTV app option as well.
The other thing people seem to talk about with F1TV is the pit lane channel, which I think is another commentary stream to listen to while the race is on? I haven't checked it out myself as I like the main feed.
Edit to add:
https://www.reddit.com/r/F1TV/ - Good resource.