This thread inspires me a bit to try and make a Deck around whatever is on the bottom of the list.
So far the bottom votes are...
Sea Serpent 2
In my mind for best... right now I see Dragons, Spellcasters, and Dinosaurs coming up on the horizon.
Warriors are always in the game in every format, they just have so much variety of play styles compared to the other Types.
Somebody somewhere has a Warrior in hand.
They are the ultimate utility player.
Bottom for me... Psychics. They haven't really found their niche yet and have so much catching up to do due to their late introduction in the game.
Rock are in an odd place. Other than the Jars, they are a lot of old, heavy DEF monsters that are slow and out of date.
OOPArts will give Rock some boost, but they are being mixed with Machines and the boss monsters are Machines.
Plus, that's too far over the horizon to worry.
I don't think (although I could be wrong) that OOPArts will make enough of an impact for Rock to be celebrated.
Rock is just too slow to be a major Type.
Aqua is weak too.
Sure, Frogs had their time in the sun, but in general Aqua is a support type for the big guns.
They always seem like the pawns you send out first to set up the Queen or Knight.