Hardly unexpected given the novelty. They should rally do a survey during the first two weeks of February 2022. The novelty value will have worh off; the Christmas and New Year sales should have finished and the tourist season yet to start.
So, to sum it up... We get a 'new' rail link in England delivered during a pandemic with threats and actual removal of services elsewhere. Infrastructure works are completed very quickly and to budget. Trains so far running punctually and reliably and they're nice and busy. A doubling of frequency coming next year, and the possibility of a Parkway station at Okehampton in the coming years...
...and still there's negativity...