I am not certain if this is a bug or an intended feature, but Blaze in the Nether start tracking and shooting at the player from any distance. This makes doing anything in the Nether infuriating because at any given moment at least one blaze will be shooting at you. They also shoot at you through walls, making it impossible to tell if you are actually in danger or not.
This bug/feature is incredibly annoying and frustrating. It honestly makes me want to stop playing the game. If it's a bug, please fix it and if it's a feature, rebalance it somehow, please.