Are we talking the soil or the fertilizer?
I'm not a fan of the soil...I make my own...MG soil is too "woody" for me.
As for the fertilizer...it works fine. I've used in in gardening for years and years...with great results. Used it on weed with great results too.
I think it's usually a problem with the grower...not the fertilizer. There are people here who can't use GH or A/N or any of the other "good for weed" fertilizers either!
If you're burning them...you're using too much. Use 1/4 to 1/2 the recommended dose...you'll see, it does grow nice plants.
This is my personal experience...take it for what it's worth.
I used A/N Sensi A+B last grow and didn't really see that much difference. I'll be going back to "the cheap stuff" my next grow, when these nutes are gone...there's no point in spending too much for fertilizers.
There are a LOT of things that work well for growing weed...IF...and WHEN...you figure out how to use them.