ALRIGHT LET'S GO:
So many of Gorillaz guest artists were stuck in England cause of the volcano. Gorillaz couldn't do anything about it. They're lucky they already got over what they had. It's not like they could have changed mother nature and got them over here. I agree, they could've tried to get other rappers at the festival to cover for em', but it'd be hard for them to learn the lyrics and everything at the last minutes.
About the hype, I don't remember seeing holograms, or huge laser shows, or anything like that promised. In fact Damon ruled out holograms a month before Coachella. Yeah, the fictional bass player of the band promised it would "Change the world of live music" but if you're actually a fan of the band you'd notice that half the stuff he says is bullshit. I agree, it was pretty disappointing for them to just stick the band out on stage like that with nothing trying to hide them or anything but whatever.
This was also Gorillaz first performance in-front of a large audience in 5 years.