heating bottles in the microwave?

Jess. • Connor James. 14th July 2016. ❤️
I've heard that you're not supposed to but I see a lot of people doing it. My baby is formula fed and I heat up his bottles in hot water which takes forever and when you have a screaming baby in the middle of the night it's a pain in the ass 😫 microwaving would be so much quicker and easier.. 
Why is this not recommended? Is it because the microwave can cause it to heat up unevenly and scald baby's mouth? is it dangerous for any other reasons?