They would look horrible in a club:
1) It's a club. People judge on appearance. If you are muscular to begin with people think you are a dumb, narcissistic meathead trying to show off. A superhero top only confirms that stereotype. #
2) You wanna show muscles but look attractive. This is where nightclub politics enter. It's cool to wear a tight white t-shirt, preferably elasticated as otherwise it will loosen as the night goes on. Also, white in a dark nightclub exacerbates definition under the t-shirt and highlights tanned arms etc.
Let me know if you need any more advice on pulling whores in a nightclub.