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For me personally it's Drk, Drg, Smn, Mch, Monk, Ast
Drk - It lost so much and you can't begin to control your Bloodgauge until 68, but it doesn't feel complete until 70 when you get TBN making the leveling process feel very awkward.
Drg- Just feels completely empty until the high 50's but even then in AoE groups you'lll lose BoTD till you get the AoE move to maintain it, even then Lance Mastery is where it gets a little more interesting. From 1-50 it's mostly just hitting 1-2-3 over and over which is really boring.
Smn - With the Bane nerfs and not having DwT it doesn't feel that great, it's not till later when you can use your new DoTs and Ruin III baseline, but being under 60 while your leveling is just painful.
Mch - You have a Heatgauge, great what does it do? You'll have to find out at 62! When you can finally dump some heat but it's not till 64 you can finally use heated shots, even then you can't control your heat so it suffers like Drk where it's not till 70 the class flows. Anything under 64 really sucks as a Mch.
Mnk - It just has nothing it lost a lot of moves and is really boring to level, Elixir Field is when it starts getting a little more fun I haven't leveled Mnk past 60 but I heard the Tackle Masteries are just "meh" and hasn't really made Mnk enjoyable, it suffers from the direction it moved from HW really.
Ast - My only real complaint is that you don't get Gravity till 52...why? Sch and Whm have AoEs at 50 but Ast does not so it feels really awkward they could just change it to get Synastry at 52 and Gravity at 50. Other than that Ast is fine among drawing and redrawing cards.
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All I can say is, I'm glad I was able to level DRK in pvp before the exp nerf/bot fest. It just feels bad taking it into leveling content. WAR/PLD just felt way more complete from 50-60 all the way to 70. All the skills gained from 60-70 were icing on the cake.
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After the "class revamp": Anything under level 40 is absolutely shallow. Some classes don't have AoE at all (Dragoon) and if they do it's on a CD of some sort (Ninja) Many classes before 35 are simply 1-2 or 1-2-3- bots.