Keep in mind the characters are based on the Marvel comic book. Jessica is super strong and the black guy, Lucas, has armor for skin and is basically invulnerable. Thus, it was a comic book fight with the thugs losing badly. What did you expect? Also, a little suspension of disbelief is helpful. Just enjoy the ride.
Before watching I'd also recommend a little research into the Jessica character. She's a broken super hero with a lot of baggage.