The main character is painfully dense and insultingly chauvinistic. It would be understandable, you know, since they're kids, xcept that the anime outright declares him to have good intuition and resolve and then portrays him as having neither. Gokudera is also awful in my opinion, but it doesn't contradict the plot nearly as badly.
The sexism really makes me want to punch the main character in the teeth. I'm hoping that's a flaw the author will have him overcome.
That said, the rest of the characters are good, the overall story is interesting, there's hardly any filler, and there are lots of good fights. Definitely a kid's show but if you can bear with the dumbed down actions everyone takes then there's some decent entertainment to be had.