I've seen those, and although Rocket League looks pretty fun, I'm not generally into online shooters anymore. The communities are always terrible, and I don't have enough time to sink to get good enough to be remotely competitive (even on pubs).
All of the three games are enjoyable at any skill level. With Fortnite there isn't a community in chat, and with the other two you're always placed at people with very similar skill levels and the communities are generally nice. It is not at all like League of Legends, just to name an example.