Its called sarcasm and hyperbole in the face of ambiguity, seeing as you didn’t realize the key level changes made in DF S4 and yet say you scored so well there as well.
I don’t think anyone (and it should be clear I sure as heck don’t) here believes you have ever rated over 1.5K at best if you are struggling in M0 as a bear. If you are blowing half your cooldowns on any single pull than you are failing to play bear properly…
I think it highly likely that you are one of the players that spent much of your time in the lower bracket and over a season got carried to higher scores. Any time something went wrong you likely blamed it on others instead of asking if there was any way you could improve like you are doing here.
Its week 0 of season 1, this is the norm. You do this week through skill and not gear. Other people can’t carry you to success. But with that said if you are 600 ilvl already than you should have 0 problems with any of these unless you are specifically trying to test different pulls to find your limits.
TLDR: You’re full of 
about everything except your struggles.