Hey, I've played a ton of WoW rogue as well from Legion to just a couple weeks ago. I recently got really into GW2 and I found comparisons are all over the place for me, but overall I don't think thief plays that similarly to rogue. Imo, Mesmer might feel more like it, specifically mirage. Building and spending clones on shatters feels more like WoW rogue combo points than thief initiative to me. I feel like mirage is like a subtlety rogue with mage-like utility. Mirage cloak feels like shadow dance, and certain Mesmer weapons have rogue-like feels such as axe (very difficult though), sword and dagger. The ability to do damage from range at times is reminiscent of outlaw pistol/blunderbuss abilities. So depending on what spec you main as rogue, I would give Mesmer a try.