I don't know what to make of him. I think his music will be appealing to young audience that is raised on Weber's musicals and pop bands.
I trust you mean (Lloyd-) Webber, t-p. Some of Weber's musicals are pretty good. I predict a bright future for 'Der Freischutz' !
Seriously, though, I found Tuesday night's offerings very boring and last night I had to turn off during the St Mark Passion excerpts. I'm not averse to a bit of rock, or even pop, music myself and but for me this stuff lacked the spark and vitality that characterises good popular music. I'm sure some people will like it but they'll be people on a different wavelength from mine. The best analogy I can think of is that I can see the appeal of, say, reggae music but really can't get inside the skin of someone who can listen to hour after hour of it. Likewise the various Latin styles. But I'm afraid I got the impression that Golijov was sucking all the life out of whatever kind of music he was writing before presenting it for performance. So, rather like Mr Lloyd-Webber, as you suggest; though the music itself didn't seem to have many similarities to any of L-W's pieces that I know.
I might give him another go tonight if I don't go to see Ian Bostridge but if it's not radically different from what I've heard already I might have to turn off again.