I wasn't exactly big on anime when I started Katekyo Hitman Reborn. It was introduced to me by my cousin and she went on and on about the story. I thought it sounded pretty cool so I decided to give it a shot. While I have to admit I found the first twenty or so episodes rather...random. Normally, I would get weirded out by Tsuna running around in his underwear, but I did find Reborn's antics amusing so I decided to stick with the anime.
When it got past the twenties however, Reborn became...wow. Just wow. Intense plot, epic battles. The story keeps you guessing the whole way. You get surprises, shocks and awesome fights along the way. There are certain times when the plot starts to get a little dull, but something immediately picks it back up again which keeps you watching more. Then there's also the little shorts that sometimes come up at the end of each episode, often being one and half minutes or so of humor that's good to enjoy after a very intense episode.
I don't really have anything to say about the story. I think it's really unique. I'd like to give examples, but I would like to avoid spoilers so I'm going to keep quiet. I just think that this plot is like something I've never seen before, or would be something I would think of. There would be times when the plot thickens and it's then that you would just keep going on to the next episode, eager to find out what's going to happen next.
In terms of character, I think they were well developed, better in some of the anime I've watched. You see how they first meet and how their bonds grow, as well as how they became stronger by helping each other. It's gives the story a more realistic feel, not like a random person pops out of nowhere and you immediately work well with them. I also personally enjoyed the inner turmoil featured in the story. Tsuna's important decisions were rather intense and you sympathize and understand what he's going through.
For the music and sound, I have to admit, Reborn has some of the best audio I've heard in anime. I enjoyed the sound effects, especially during battles and comedy moments. High and low pitches really affect the ambience of the scene and I think Reborn synced their sound with the animation and scene very well. The music and soundtrack is also great. I find most of the openings and endings incredibly catchy. The soundtrack contributes to the mood and how the character is feeling.
Overall, I really enjoyed Reborn. Don't give up if you find the first twenty episodes or so dull, stick to it and you won't regret it!