@R3DAlert:
I don't know about you guys but whenever an arc has a lot of characters. I just expect much from the likes of Vergo, Jozu,Marco or those who fought in Dressrosa tournament. I know war has many characters and even a tournament but we weren't properly introduced to this characters. Impel Down on the other way had a lot of characters but they all contributed to the story even the vice-warden(cant remember his name)Buggy, Galdino, Bon-chan, Ivankov. They all mattered.
The thing about about Impel Down was that almost all the characters that were in the arc had already been in another arc and had been developed appropriately while all the chars in this arc and the marine ford arc are brand spankin new and all needed some type of development and some got more that others.
–- Update From New Post Merge ---
@Fraco:
I really don't know, it seems to me that we readers are more eager to find rules to identify different behaviors than Oda himself. I mean, to me, fruits seems to be classified in 3 types (logia, zoan and everything else). paramecia itself seems to be a scapegoat to collect everything cannot be qualified as one fruit of the previous two types. I don't know if what you say is only fan speculations or something that can be taken as a truth.
There are officially 3 types of DF but Paramecia's have some unofficial sub categories as said by uniaka. IT seems like the awakened DF abilities of the ppl who can create things (DD, Galdino, Megellan etc) can turn things into the thing that they control. While the ppl who have been transformed into different substances or can turn into that substance, but not control it, (jozu, Luffy, Buggy etc.) would be useless to turn things into that substance because they can't control it, unless of course their awakened DF allows them to do this.
Also just to throw this out there Zoan's look like they just get really big and have crazy endurance. I also think that Logias can turn things into that substance they control for forever PH being the most prominent but Croc can also make a desert with his DF so maybe that is what they are able to do.