It is a weird one. Their first 3 records are timeless, for me, the rest very hit and miss.
2011 I opted for The Chemical Brothers but I went in 2016, and it was undeniably amazing. Their 2005 set is one of the sets I enjoy watching the most, from the festivals before I started attending.
I think now, from a Glastonbury perspective, it just feels a very lazy/easy booking. Generally, their new stuff/shows feel very different. It's becoming hard to take Chris seriously running around dressed like that approaching 50 as well, but that's just me.
Having said the above, I won't hesitate to go and watch them at next year's festival if I get a ticket and there isn't a bad clash. I think ultimately, they are an easy target for people as well.