All of the Straw Hats are great characters and each of them has gotten great moments so far. Unlike the other members of the Big 3, where the main character is usually the only one shown getting stronger, everyone gets the chance to become stronger so they don't just get knocked out of a fight immediately. They all feel like legitimate characters. My personal favorite being Ussop because I feel he has come along way since his cowardly beginnings both in terms of his tactics and in terms of his creativity. Characters that might seem broken actually aren't as the anime/manga makes it very clear that no matter how strong someone gets, there will always be someone stronger down the line. This leads to a lot of very gripping, intense fights. My personal favorite arc so far is the CP9 arc because it shows exactly what each of the Straw Hats are capable of. The villains are unique, very memorable, pose a great threat, and in general are just fun antagonists. Every battle in this anime/manga has this sort of grand feel to it which lacking is really lacking in Naruto and Bleach.
One Piece is that at that level of weirdness where everything just seems to make sense no matter how odd or outlandish it gets. Seriously, only in One Piece can a cola-powered cyborg shipwright, fish people (not just mermaids), a skeleton musician with an afro, and a talking shape-shifting blue-nosed reindeer doctor make total sense. My personal favorite example of its weirdness however comes from the Alabasta arc. It is during the battle where Chopper and Ussop are fighting Baroque Works agents Mr.4, Ms. Merry Christmas, and their cannon dog Lassoo who is quite literally a cannon that ate the Mutt-Mutt fruit Dachshund Model.
|One of my favorite Devil Fruits: Ace's Mera Mera Fruit.|