Recommending M.G. is not crappy advice, it was advice, the time released granulates in the soil are little to nothing at best, and also for people without a hydro store, M.G. soil runs like 1/2 the price and comes in a 2 cu ft. bag from walmart. If the nutes are that big an issue, then just run or wash the soil out really good before using it!!!! Also M.G. makes a organic potting that is actually comparable to F.F.O.F. I.M.H.O.
I would never recommend to anyone a grow tek I have not personally ran and have experience with.
Now M.G. isn't best, that is true, but there are plenty of people from small growers to bigger cash croppers whom have used it and used it for plenty of time with good to excellent results.
In regards to M.G. making ur plants taste like crap; while any synth salt based nute if not flushed at the end of cycle will affect the burn, and taste of ur crop. SO keep that in mind and take what people say with a grain of salt.
I stand by my most important remark, growing period will teach you and help you understand alot more then not growing regardless of what soil / nutes you use.