What on Earth? You're possibly the only person on the planet with this opinion!
TF2 campaign is very widely praised, it has fantastic pacing and level design and its a great story. TF1 was just multiplayer maps with some dialogue in between.
Oh I am very aware that it is a rare opinion.
After the initial TF2 hate by primarily xbox fanboys, the love for the game has been everywhere and it's so incredibly awesome. TF2 has relatively bad level design and story in my opinion and I'd argue most fans loved it for many other reasons . BT was an awesome companion, worldbuilding teased a lot of cool things, cool gameplay, cool sets, etc. I prefered TF1 because it was a leaner experience that had most of the positives but a lot less of the padding.