It really isn't.
Your head is constantly cocked at an angle and the home run posts are really annoying.
Ironically, the seats with the best view are the bleachers but your average US soccer fan is not capable of sitting on one for 45 minutes.
Baseball games at Yankee Stadium are great. But it's very American. Loads of food scoffing, people wandering about chatting, turning up at the start of the 6th inning. Shitloads of breaks in play for commercial tv. I love going but just don't think it fits culturally with sports in the UK.
Now...