Aight boys. Imo Firestorm is def top 10. He's solid all around. Great at mid-range, becomes a strong zoner vs characters that have trouble getting in against traditional zoners, has some of the highest corner damage and pressure in the game, and a solid staggerable mid-screen and corner mixup game that can't be ignored. He needs meter to do any damage midscreen without trait but most of your midscreen combos will carry to the corner or restand in the corner depending on where you start, so the meter is very worth it. As a top 150 leaderboard Firestorm in ranked, I've played almost every matchup whether in ranked or sets with different specialists. As far as how he does against top 5 characters, i believe he goes even with supes, even with deadshot, loses to batman, even with black adam, and beats aquaman 6-4. Firestorm can punish tent strike from any range and trait doesn't help aqua in the mu at all. Some more losing mus I see are Green Lantern and Darkseid.