They're probably rating the first tournament so highly because it's as much of a game changer for Dragonball as Saiyan saga was. The tournament arc is what shifted it from an adventure gag manga to a battle gag manga that slowly shaved off the gag part. They unfairly rag on Buu saga because they overly embellish the Cell saga, and probably also because they dislike things like Gohan losing prominence. People who hate on Buu saga always seem to forget that fusions come from Buu saga, though, and those are some of the most popular things next to super saiyans.
That wasn't when the shift happened though. Tien's tournament was the one that was half gag half real fights, Roshi's was still fully gag fights/martial arts parody. It didn't change anything, as far as the direction of DB as a gag or battle manga. The only thing that arc did was be more popular than arc 1&3, which is important for why the series went in the direction it did after Red Ribbon, but it wasn't because the first tournament was made to be different compared to the other two arcs.
Buu gets a bad rap because Gohan turns into a lamo at first, but then the complaint turns into "Super Buu is just Cell again". Which is rich, when you consider that nobody complains that Vegeta&Frieza are both just King Piccolo version 2&3.
@Crystal Head Reloaded "Watch DBZA" used to be a joke whenever people asked what's the best way to watch DBZ. A tongue in cheek shitpost. Unfortunately, most TFS nufans are retards that can't differentiate jokes from reality, so they unironically started believing and parroting it, in the hopes of being the smartest fanboy in their minds. Hence also parroting literally everything TFS ever said.
My favorite one is "Goku forgot to take the cure for his heart disease". If you tell them what actually happened, that the medicine is for treating the disease after he gets it only he got it a lot later than he was supposed to, they react as if you said the earth was flat.
@Jeff Gerstmann You're treating Gohan as if this is some emo Harry Potter shit, lmao "instill good values". This isn't unique to you, the whole "Goku is a bad parent" take relies on shallow, out of place parental psychoanalysis, which is so far removed from what DB is and how the characters are written an behave in it, that people can't even formulate a counter argument that isn't equally stupid psychoanalysis since the supposition is based on autism. Like, actual "I can't read social ques" level autism.
I mean jesus, you're projecting passive aggressive parental disappointment intended to cut into his son, on a few lines of irrelevant throwaway dialogue.