I hear your argument, but I can't validate it bro. I disagree with just about all of your points. No way Frieza was similar to Majin Buu (one of six diff. versions). each saga was literally that; a Saga. It wasn't just "beat one enemy, bring on the next", it was a lot of background and story development that led up to these grand boss battles. Background and story development that was unique, BG and SD that we all grew to love.
Trying to be as unbiased as possible. I keep going back to it, but that background and story development was some of the most dynamic and interesting writing in all anime. When have you ever actually been bored (action OR plot) watching a DBZ episode? Kinda unheard of. In hindsight it wasn't the greatest show, but that's only looking at it in this generation's paradigm. Having a new-age perspective on a classic anime like that makes it hard for clear judgement (the animation was still grainy for godssake!).
In the end I can respect your disappointments with certain aspects of the anime, I cannot respect your opinion of it tho. It is far from a basic anime (very inventive fighting style, lovely drama, and ultimately pioneered fighting anime today). DBZ is five stars.