I wouldn't say Miracle Grow is impossible to grow with, my cousin used to do guerrilla grows with bag seed out in the woods, and all he used was the Miracle Grow blue powder that most people grow tomatoes with, his herb harvest in the fall time was always a half-ass high and a metal after taste like you had been sucking on a spoon. All he cared about was weight, he didn't care at all about quality, this was back in early to mid-90s, he was a cheap bastard too, ain't know way he would've payed for seed or electricity or any of the other stuff that growing indoors requires. Me and him are like night and day, I'd rather have a small amount of QUALITY than a large amount of mid-grade.
My opinion would be to stay away from MG products, though I'm not going to put down anyone that uses it, I know that I had bad experiences with it and I hate it, I really wouldn't recommend any fertilizer or bagged soil that comes out of a place like Lowes, Home Depot , Wal-Mart , Ace Hardware, ect. I like FoxFarms ferts and their soils are good too, but Earth Juice is good, Pure Blend Botanicare is good too. I just tend to stick with products that I've had good results with, I need a decent camera so I can post pics.