Actually unpopular opinions:
Battle royale games won't be bad to spectate if done right (They're literally based on a successful fictional premise that's supposed to be enticing to watch, it's going to be pretty easy to understand for spectators).
Whether fortnite has robust enough mechanics to actually qualify it of being 'deserving' of being an esports title (this doesn't actually matter to 99% of people) is another question. It's certainly no quake or starcraft, but imo it's got more room for mechanical skill than a lot of existing esports that have prizepools.