the main reason every seems to find sephiroth easy is because they have all of the ultimate weapons and kotr and excellent materia combos. when i first beat him i had barret and tifas ultimate weapons and no ultimate for cloud, i didnt have omnislash and tifa had level 4 limits, barret had level4 but his limit far was pretty empty. i a lot of HP+ materia and also had the contain materia and ultima and typhoon but noe of these are massively destructive.i struggled through the battle and eventually won with everyone on low health and it was one of the hardest bosses on the game. the reason everyone else finds him easy if because of omnislash and kotr, try beating without attacks which do about 100,000 and youll find the challenge. with attacks like supernova and attacks which can do a lot damage and status effect id hardly call him easy.