DRG certainly if we are going by melee dps. Like DRG is what the 12 second GL MNK used to be.~
Lets put it this way, imagine if chakras were only generated by howling fist and elixir field but they don't directly generate chakra, they proc steel peak which gives the chakra. This means if you use elixir field and howling fist one after another you will lose a chakra for about 30 seconds. You only need 4 chakras and they are tied to greased lightning meaning that if you lose GL you lose all your chakras. However riddle of earth maxes your GL3 without needing earths reply.
Now even with all of this, DRG is still worse off. First of all, it takes a minimum of 4 GCDs to refresh BotD and this is with DRG being the slowest melee (no GCD enhancers). So you need minimum of 8 seconds (reaaaaally pushing it, you would need to live in the data centre to trust this, Id just say 9) on your timer to be able to keep it. However BotD isn't as powerful as GL3 no, but it also doesn't activate automatically like GL3. If for some reason you cock up and lose BotD right after using it, you won't be able to access GSK, the 4th combo enders or more powerful jumps for 15 seconds. You also won't be able to store eyes generated from the jumps.
As with my example, imagine losing GL3 due to forced downtime or bad rng (susanos jail) and losing 3 chakras along with GL3? This is a bit of a stretched metaphor but it is just for painting a picture why DRG is quite punishing. Finally DRG loses 70 potency on heavy thrust, 50 on chaos thrust and 90 for the combo enders so if you were to miss all of them (that's about 11 seconds of not being able to hit positionals) you lose 300 potency. For MNK, if you were to miss all positionals for a 11 second period (6-7 GCDs) you would lose about 80 for bootshine (crit modifiers n shit), 30 for twinsnakes, 40 for demolish, 40 for dragon kick, 40 for true strike and 40 for snap punch (please correct me if I'm wrong, I don't even remember the potency changes between now and heavensward) which adds up to 270 for 6 GCDs and if we were to follow this rotation 350 for 7 GCDs.
Point being, for a class that does some assjuice levels of DPS, DRG sure is harsh.