Problem isn't that there isnt one stronger class then another, the problem is that all the classes are really strong and really powerful in their own right in their own different ways and it takes different types of players to learn how to use them to their full potential. Which makes each one of them individually more over powered than the next. There is no master class only guardians. In fact it seems like most people when they first started at the game picked their class purley based off of the aesthetic. I know Deej originally started as a warlock main because it was "deliciously eccentric" and he loved the style it had to offer. My brother and I main titan from d1 y1 because that's the aesthetic we both prefer. Then over the time we have put in we have both gotten quite good with all of our titan abilities pve and pvp. Don't believe me check my stats. ( though my skirmish that is skewed because I got thrown into a game that could an end on 3 separate occasions, and was glitched I just decided to play that for a few hours on one of those occasions ) I've come across Titans that are absolute monsters in the crucible and then also Titans that have no idea what's going on. I've come across hunters that are amazing and some hunters that are terrible, warlocks are amazing and warlocks are terrible. A subclass is only as good as you play it. Some have more uses than others at times. Who honestly thought before shadow shot the hunters were even remotely useful in pve, with the exception of going in vis and reviving but thats it. Then came the Crota fight, then the hunters had their day in pve. Same could be said for Titans in pvp, just okay to have then along came pre nerf hammers, and bam, Titans soar above the rest in comparison. Every class has its day, it's moment in the sun, it's one thing unique to it that it accelerates at. Long story short there is no master class only master players.