Melissa McCarthy is a very hit and miss actress in my opinion. When she’s on, like in 2011’s Bridesmaids and 2013’s The Heat, McCarthy can light up a screen and be as funny as anyone in Hollywood.  But in films like 2013’s Identity Thief or last year’s abysmal Tammy, McCarthy’s talents are wasted as she lowers herself to lowbrow, immature humor that makes her annoying and, at times, unbearable to watch. I am happy to report, though, that McCarthy is marvelous in Spy,…