Not really, it can drastically change an opinion about an artist, for the bad or the good. And if its bad, it doesn't help at all. For example, Lana Del Rey on SNL.
Lana heavily benefited from that performance. Press is press, good or bad.
and imo, the 4 promo was wierd. she booked some good shows but it there was no sense of anticipation. everything just sort of happened out of the blue.