Personally, I think to the average non-enthusiast, the much hyped Elizabeth Line must look a bit underwhelming and overrated. I can't imagine many of the everyday public know that it will soon be joined up to create a fantastic commuter railway.
I only say this because to them, it's something constantly described in the news as costing hundreds of billions of pounds and being an absolutely ground-breaking railway, and then when it finally does open, it's a complicated set of three entirely separate lines, with very awkward walks and ascents/descents between them. Many will see no difference between Elizabeth line and what they've been commuting on for the past five or six years - the West end has a large 2tph section, the East end is still being served by some of the old crappy trains from the 80s in peak hours (both have had no difference to TFL Rail but a name change), and the Central section is effectively a fairly short limited stop shuttle between the extremities of Central London - which doesn't even run on Sundays.
Don't get me wrong, I'm thrilled for the eventual joining up of the network, the 315s finally being scrapped and the looming massive increase in frequency. I think Crossrail is a fantastic achievement. But all I'm saying is I can certainly see reasons to why Joe Public, who likely don't know it's opening in stages, might be underwhelmed.