Gorillaz is definitely a unique music selection. You either hate them or love them, no real inbetween unless you just like the mainstream songs like Feel Good Inc and Clint Eastwood.
So far I'm loving all the songs in the new album. Some of the songs are a bit too political for my liking but as an art form, they're enjoyable.
I can see why people would note that they're rather different to their usual style, but I'd just tell them that's what makes Gorillaz unique - they're not bound to any specific music style.