I definitely find CF better than THG, but between CF and MJ I'm still undecided. In CF many fascinating new characters were born who we actually learn something about. In THG, apart from the central characters, only Rue was given a fair mention. In CF we also see the relationship between Katniss, Gale and Peeta blossom, the latter not just for show. And the story itself: The rebellion brewing and climaxing, insight into the cruelty of the Capitol, brave characters risking death for a cause, the tragic romance of Katniss and Peeta where both accepted their own death for the survival of the other, all lead to an ending that (quite literally) blew THG out of the park. There were also many moments of humor that I enjoyed very much (the chess scene between Haymitch and Peeta, drunken conversation between K and H, the sugar conversation between K and Finnick followed by K pretending to be seductive with P, etc)
With MJ, it's a very different kind of story. Very much darker, serious and thought provoking. It had a far greater emotional impact on me than the other 2 books. It requires many times of re reading to fully appreciate the plot and the messages in it, and each time I re read it, and thought about it more, the more enjoyable I found, hence my conflict between these 2 books.