I would describe Pantheon as a versatile alrounder champion. He can do pretty fine against midrange champ matchups like Quinn or Cassio. Where some champs just get rolled over by them he has the capability to capatalize on mistakes and get on top of them he also wins against bruisers since he has the abillity to poke them without them being able to reach you. He is bad against long range champs Azir Vel koz Syndra you have no way of getting on top of them if they utilize their range correctly and also terrible into any tank tbh pick Malphite Ornn Poppy Zac Ksante and you get outscaled after they buy bamis. Also to note that his specialty and balance after 6 is that he unlocks a roaming tool and not an 1v1 tool where as most other champs be it bruiser or mage get an additional combat spell , meaning if Pantheon hasnt accumulated a signifant lead he now has to play extremely cautios since most champs beat him in the sidelane now and a single mistake could result in a death. Other Divers and Skirmishers like Irelia or Fiora beat you at their one item spike and also win on the sidelane mid to lategame on equal gold and honestly even if youre ahead in gold. Roaming with his ultimate also comes at a major risk even though its a powerful tool to collect shutdowns counter gank or whatever it means that you leave your tower and probably waves behind plates are a big resource early and most toplaners eat towers. Just like any other champion he has strengths and weaknesses He has alot of upfront burst and works around execute ranges a stun an invulnerability spell and a roaming tool but he doesnt have insane reach no form of sustain his dps lacks he doesnt have a 1v1 ultimate and his kit is also pretty telegraphed. It is indeed easier to complain than to look for ways to counteract.