Asgorath
Explorer
We don't use feats and they are optional, practically on 1/3 hits hunter's mark will go down without a feat. If you use them and want damage the best feats are GWF, Polearm master and sharpshooter and other classes can have hex, the gap with other classes will be bigger. I also find a bit disgusting that you need that one spell to try to keep up with other classes, if it is so important they should have designed the class better.
1d8 is good, but beyond the second attack that's all the extra reliable damage you get till you reach level 20. At that level other classes have some good powers, monk can have two more unarmed attacks, the berserker another attack, the battlemaster has his maneuvers, the paladin can make his weapon magical with +CHA to hit, or have advantage against one enemy, etc.
At level 11 a champion will have 3 attacks which can be also used at range, more initiative, general durability, better saves, action surge, etc, that makes him far better at combat. The melee ranger will be better tracking under some circumstances, moving over some plants and camouflaging, I don't find this very interesting. A barbarian can tank and will hit more often so damage is not that different unless we go to the berserker. The warlock thanks to spells and class features can deal more damage and tank better. A monk using Ki can deal more damage or have more AC, then you have the features of each subclass.
The good thing of the hunter focused on ranged attacks is that you can use volley more reliably and it should be more difficult to lose Hunter's mark if you have space to move. That makes him good at combat but as I said I don't like the class features.
Hex is okay, but it's disgusting that Rangers have to use Hunter's Mark to be competitive? I don't follow. I've never heard Monks classified as the top-tier damage dealers, but sure, everyone knows that Barbarians, Fighters and Paladins do the most single-target damage. They generally also have to be in melee to do that damage, so good luck against a flying dragon or some other creature smart enough to not engage your melee combatants.
The Gloom Stalker's has a nice level 11 ability, it lets you take a 3rd attack if one of your two regular attacks misses. Is that as good as a straight 3rd attack every turn? Nobody else but the Fighter gets that, so this seems pretty powerful.
Vanish gives you a bonus action to Hide every round, which gives advantage on one attack per turn for free (unlike the Vengeance Paladin's ability, which is once per short rest). Is that as good as Reckless Attack? Not sure about you, but I'd rather be shooting my bow from as far away as possible than being in melee.
From my perspective, there's more to the game than just combat and characters that are highly optimized for combat only often struggle to be relevant in the other parts of the game. My party doesn't have a Barbarian, Fighter or Paladin and as a result my Gloom Stalker is easily the highest damage dealer on average thanks to Sharpshooter. We had a fight recently where I could stand about 300 feet back, and thanks to the fact the enemy had a light source, I had advantage on every single attack and was putting out 40+ damage per turn at level 7. The Ranger does not feel weak in combat to me. Does the Beast Master need some help? Undoubtedly. I also don't really care that a Barbarian, Fighter or Paladin with GWM could out-damage me.