I can't believe the continued assertions that there's no evidence Boba Fett was supposed to be some legendary badass.
First of all, there's his genetic predisposition. In official canon, he's an unaltered clone of the man who was hand-picked by Dooku to be the *genetic template for an entire clone army.* Boba Fett was literally born to be a proficient warrior. It's not like he's some sort of LeBron James Jr. who may or may not have inherited enough of his father's genetics to be equally great; he's an exact ******* copy! He essentially *is* his "father."
Second of all, unless you're willing to believe that Darth Vader (right-hand man to the Emperor) used Craigslist to find bounty hunters in ESB, you can safely assume that he was trying to get the best available. And Vader was specifically aware of Fett's reputation versus any of the others.
Lastly, there's a reason why Fett was portrayed as a top-notch badass bounty hunter in tons of EU content: because any writer with common sense could've pieced together enough context to understand that being a bounty hunter in the SW galaxy is the epitome of survival of the fittest. It's sometimes literally a cutthroat business where you don't survive the competition for bounties, and altercations with quarries, unless you can handle yourself exceptionally well in combat. Whether it was the Holiday Special, or ESB, or the EU stories, this character was meant to have a role in the universe more meaningful than just "average" bounty hunter.
When you watch Jango Fett go toe-to-toe with a Jedi (Kenobi), you're basically watching Boba Fett. He's an exact genetic replica, and raised by the warrior himself. Jango was supposed to be the greatest bounty hunter of his era; Boba was supposed to be the greatest of his era. Period.
If you claim there was no evidence for him being a badass, and clinging to the absence of explicit onscreen examples. you're just not paying attention to the intent with the character. He was designed aesthetically and conceptually to be the SW version of Eastwood's "man with no name," and then was given a backstory to show that being an elite warrior was not only his genetic predisposition, but his intended destiny.
