Starbucks coffee is not bad, in my opinion. The problem is the
optional "fanciness" they put into it (all that disgusting caramel, syrup, cream and whatnot), and the huge amount of milk they put into their lattes and cappuccinos. Their actual coffee, which you can taste if you order it black, is good. I don't think they burn it.
I like milk in my coffee -- what we in South America call "café con leche", which is closer to half and half -- but unfortunately Starbucks doesn't offer anything like it. You can ask for extra shots of coffee but they charge extra, and their coffee is already expensive as it is.