In my experiences using MiracleGro, I've mixed 1 tablespoon/gallon of the of the crystal-like fertilizer with water. I've used that for years now for weed plants and in my veggie garden. Thats full strength. Feed it every 2 weeks throughout vegging and switch to whatever you want for flowering.
Your first feeding should be 1/2 strength, don't feed it too early, etc, etc.
And I kinda think that many people on the forum have no problems with MG fertilizer and actually it is used quite a bit.
On the other hand,
MG soil isn't recommended for new growers because it comes with slow release nutes in it.. which usually means that the over-ambitious noobs burn the plants because they've had no experience dealing with this problem before.