The mistake that people like you make is comparing Crawdaunt to Azumarill. The similarities stop at "physical Water-type attacker with Aqua Jet". Azumarill is primarily a late-game sweeper with Belly Drum, because it isn't going to set up successfully midgame when its checks and counters are still alive, and it isn't going to set up more than once. Crawdaunt is used for midgame wallbreaking and revenge killing. Like everyone else said, it comes in to pick something off with Aqua Jet, or threatens something out with Crabhammer/Knock Off and wears down its teammate's checks and counters.The problem with Crawdaunt is that part A doesn't happen very often because of its terrible bulk and speed. No one is questioning the power of Crawdaunt, but that power is useless when it is usually being killed first. Most of the threats in the S and A ranks have the speed and power to take Crawdaunt out before it can do anything other than Aqua Jet. Its niche over Azumarill is very narrow which is why I think it should remain C+.
I have a few problems with this. First off, max HP Crawdaunt is dumb, so it's not worth mentioning. Aqua Jet is not "terribly weak" compared to other priority. STAB Adaptability Aqua Jet hurts a lot of things. See posts above mine for lists. Crawdaunt's low speed isn't a problem when it's doing its job as a wallbreaker. Crawdaunt's targets generally don't invest in speed, and 252 Adamant Crawdaunt outspeeds 0 Spe Rotom-W and below, which is a hefty chunk of the viable defensive Pokemon. Your last point bothers me the most. There's good reasons why Crawdaunt was RU last generation and is BL now, namely the awesome utility of Knock Off (by the way, Craw's Knock Off is the strongest in the game) and access to strong STAB priority, and your wording makes it clear that you're absolutely heinously underestimating the utility and power that STAB priority provides. Comparing Crawdaunt to Rampardos? That's just ridiculous, to put it bluntly.I'm honestly not seeing what makes Crawdaunt worth using. It's strong, sure, but 65/85/55 defenses do it no favors (even with max HP it crumbles to remotely strong hits, some even resisted). Its low Speed and bulk force it into Aqua Jet frequently, and Aqua Jet is terribly weak. It has a nice but not great defensive typing, but its awful Speed leaves it vulnerable to things like Aegislash and Heatran, things you would expect a Water/Dark to beat... And honestly, what does it even threaten? Hippowdon? Tyranitar does upwards of 65% with a single Stone Edge and that's about the only thing Crawdaunt can creep due to its lack of bulk.
It's basically Rampardos with a different type and priority. Considering how often Rampardos isn't considered on a serious team, I doubt Crawdaunt would be either...
EDIT: Also, just for those people who capitalize on Crawdaunt's low bulk, it's actually comprable to Deoxys-S.
252 Atk Aerilate Mega Pinsir Quick Attack vs. 0 HP / 0 Def Deoxys-S: 106-126 (43.9 - 52.2%) -- 15.6% chance to 2HKO
252 Atk Aerilate Mega Pinsir Quick Attack vs. 4 HP / 0 Def Crawdaunt: 111-132 (41.4 - 49.2%) -- guaranteed 3HKO
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