These re indeed going to be large, capable carriers...having said that, the UK messed up royally when they chose to not use catapults or arresting gear and use a ski-jump instead.
So, no E-2D Hawkeye AEW aircraft (very critical) and no larger war loads on take-off for various types of aircraft.
They will end up with the F-35B, which for sure is going to be a far greater assert than what they had in the Harrier force before, and with their stealth and ability to be refueled will give them decent range.
But, in an effort to save a little money (relatively speaking) they are building large 67,000 ton aircraft carriers that have been needlessly hobbled in terms of their own situational awareness, self-protection, and strike capabilities.
In the modern era, Carriers require a fast, capable picket line of Aegis destroyers...nuke subs...and back-up carriers.
Or, they must be relegated to being part of a US Navy Carrier Battle Group.
I don't believe Britain has sufficient surface and sub-surface assets to protect these ships operating independently. I would like to be wrong, but don't think I am.