Your personal opinion, myopic as it may be, is true only in the sense that it didn't keep to the pre established story lines of BBT. However, considering the spirit of BBT which embraced the Marvel view on Multiverses and Alternative Timelines, I believe form the basis of a "What If". I posit that it honors the BBT and ratings don't lie it was an unmitigated hit generating it's own spin-off when it got too closer to the original Timeline.