Bands often have a good first album full of songs they wrote before they were seriously a band, with all the pressures of touring, getting along with each other and so on. The Beatles changed when they stopped touring. Often a change of personnel can change the band completely. Fleetwood Mac, Genesis and Pink Floyd changed considerably between early and late. Even a new drummer or bass player can freshen up a band. I can think of one band that had a good album, four or five crap albums and then another good one. Actually a question of whose in the band at the time.
IMO obviously.