Hahahaha love your username.
I've heard that the quality has gone down, I've l also heard a lot to say that a big part of the nostalgia for the old days because the meth was so much better is due to becoming so accustomed to drug and maybe burning out over time. This kind of dope wears down on you, and not being able to get the same highs anymore is in addiction 101. Even the novelty is gone, felt it a million times right. I've used crystal on and off for 14 years, though mostly in the last 3-5.
I don't feel the same way on it anymore either. But I know the quality is actually better now than what I used to get in the earlier days.. my sources used to be copping city streets and shitty junkie rooming hotels. Top dollar for what was bullshit compared to my deal now. I attribute the ineffectiveness of the dope now to the addiction totally. If I take a short break I get some it back but not all of it.
It could be the area you live in. I've read some stuff saying you guys in the States get a lot of cartel shit which isn't great.