These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Crazy Awesome: His no-holds-barred insanity got him noticed, defeated his foes and won him his fans. As he gradually evolved into a more deliberate, motivated character, he began to fail more and more. The Looney Tunes Showdeconstructs this trope by bringing back his insanity, but forcing him to suffer more realistic consequences for it (he can't hold down a job, he gets thrown in prison for contempt of court, etc.), ensuring that he remains a Straw Loser. Nonetheless, his craziness has made him one of the most popular characters among fans of the show.
Though in an earlier draft of the screenplay, their intense battle on the piano proves to be only a stage act, and the two Ducks are revealed as quite good buddies off-stage.
An even earlier draft written by Chuck Jones involved a "Show Biz Bugs" type scenario with Daffy and Donald battling for audience appeal, while Donald is met with applause and roses, Daffy is met with the usual cricket chirps. Daffy was apparently such a Straw Loser he made even Disney's biggest Chew Toy and Unpopular Popular Character look like a winner.
This was parodied in Bugs Bunny's 50th birthday special from 1990, where we see a crowd of pro-Daffy protesters shouting against Bugs. It turns out that Daffy himself paid those guys to support him, because no none could possibly love Daffy more than Bugs.
Jerkass Woobie: Sure that Daffy is a self professed cowardly and greedy egomaniac, and has a plenty moments of assholery, but he's also a HUGE Butt Monkey and knows no better, making him one of the most pathetic characters in the Lonney Tunes Universe.
Rooting for the Empire: Whenever paired with Bugs, most of the audience wants him to win, despite knowing that he never will.
Unintentionally Sympathetic: Believe it or not, he could occasionally be this in his pairings with Speedy Gonzales. For example, in "Daffy's Diner," he's just trying to protect himself from a vicious bandito cat named El Supremo who threatens to blow his brains out if he can't produce an authentic mouse burger. Even though El Supremo is probably the real villain of the cartoon, it's Daffy who gets the short end of the stick at the end. Meanwhile, in "Feather Finger", Daffy's a homeless street rat who gets conned into chasing Speedy by the conniving Mayor Katt - and yet, the little black duck winds up being the loser of this cartoon as well.