If they were deploying with a large and comprehensive air wing I might agree with you. However, since for the foreseeable future the largest probable air wing will include one Sqn of 12 x F-35B I do not.
A naval focussed article, looking at recent RN carrier history in the Falklands war, estimates the majority of sorties were dedicated to AD CAPs, looking at the figures gives a realistic estimate for the QE as requiring at 8 aircraft. Leaving an offensive capability of a 4 ship - assuming full serviceability. And of course a radius of action meaning operating no more than about 240nm off shore......
Would Britain Really be Back as a Traditional Carrier Power?