I'm certainly the biggest Reborn fan in this thread (my nickname that i use everywhere for almost 10 years is because of it and Reborn is my favorite char ever), it's a bit complicated, the final arc wasn't really good but be sure, wasn't any Souma, Gantz or maybe Bleach level of bad, it was just underwhelming and the end was quite the "open" ending.
For the series as a whole, the first volumes are basically a gag series to introduce all the main and overall characters you will follow the entire manga, they ARE important to read/watch, if you skip this comedy part you will not be so familiar with these characters and they will not be as charismatic they should be, but yeah, isn't the best part of it but when the battle shounen part start, it's REALLY good, the best part of Reborn from start to finish is the characters interactions, the creative powers and good fights, isn't the best series ever, it has problems and Tsuna can be in fact annoying (Imagine the Deku from the beginning but in a whole series), but the entire cast of characters, their personalities, Tsuna interactions between Vongola family and specially Reborn is what makes this series something special.
I would really advise to pick the anime, isn't only a really great adaptation but even have extra arcs writen by Amano only for the anime that are really good, also the first gag arcs are much better in the anime.