Explain evangelion in 3 sentences or less
Shinji Ikari, a young and socially undeveloped teenager is a key piece in his distant father's secret plot to utilise the re-emergence world-ending alien race of monsters, called "Angels", to bring back the wife/mother who was tragically killed when the Angels last appeared on Earth. His father's front to help develop his plan is to use the EVANGELION program (giant mechs that are piloted by and linked to specific teenagers) to destroy the Angels, while awaiting for the perfect opportunity to bring the world to the edge of death to the save the one he loves. All the while, other forces conspire to use the EVANGELION program for their own devestating means of control.
are halo games actually fun
Halo is what got me into game dev, and it's still some of my best moments in gaming. But I highly recommend you play with friends, splitscreen. And only play the Bungie ones.
why are the flood so loving annoying to fight against
The Covenant are very reactive, and they're easy based on your gaming history to understand how to defeat them. They scream in pain, have funny dialogue, very clear identifiers as to their status (shield down, in pain, aiming at you etc) and so forth. They're incredibly enjoyable to fight and they have some very fun designed encounters.
The Flood are designed to be stressful. They don't react as much. They don't speak your language. They're given an atmosphere that's creepy and messed up. They also are a bit more puzzling to kill as their mechanics are a bit different (such as the Flood Carrier spawning Infection Forms when they explode, or all Flood's critical spots in their chests instead of the head).
Things are annoying when they break your expectations in ways you weren't prepared for. You play a game, learn something and then the game suddenly does a flip without giving you time to warm up to it. The Flood represent this kind of switch up.