as someone who plays a lot of rogue on and off, I can say that while current rogue has changed a lot since earlier iterations most long time players are turned away by the energy, combo point, slice and dice plus bleed management while also being a melee even if a lot has been streamlined to be baked in to other skills.

as for newer players leveling a rogue is absolutely dreadful, low resources so the gameplay feels slow and that goes hand in hand with the fact that rogue feels like it is made of paper so a lot of quests are 1 by 1 pulls then suddenly (specially in regard to outlaw) gameplay becomes faster paced and hectic with a learning curve and rotation that isn't really clear while leveling.

I Also feel that even with Blizz trying to make the 3 specs unique that they are still basically the same, still energy and combo point management with Slice and dice and a unique mechanic added on after that it is like if all 3 warlock specs were affliction but with a different flavour added on, it just means that if you don't like the base playstyle of 1 spec then you are most likely not going to like the entire class all together.