I've played it on the Switch during one of those demo events. Simple: Jaggies, blurry textures, all around low image quality, occasional framerate hiccups. The style only partly makes up for it, as it's not nearly as abstract as Wind Waker.
Personally that doesn't bother me, and in the context of a handheld systems it's certainly impressive. But it's simply not like we're talking about high end visuals here or a visual style that completely compensates the technical limitations of the console. If that's something you put emphasis on in your games, I can easily see how it could bother somebody. Quite apart from that, the limits of what the machines it runs on may be apparent in other aspects, which I couldn't tell from from my playtime. E.g. if you've larger team battles in other games and BotW only ever has you battling as a single character against no more than a handul of enemies.
I'm mostly excited about all the ways this finally mixed up the Zelda formula and this being a true open world Zelda game, therefore I'll probably love it. But open world games on about this technical visual level have been around for nearly a decade, that's simply a fact.
