I dont think DRG is weak. I usually outdps everyone in coil. The only one being better is MNK in my eyes but i feel on bosses, single target dps should be above all ranged dps. At the very least higher than bard for sure.

I also dont think the class is badly designed, take a look at all ranged dps, they certainly dont have lots of interesting mechanics. I am playing both MNK and DRG and in my eyes they are by far the most fun to play dps.