He counters most of the meta champs, deals heavy damage and CC, is a very versatile champ which can be flexed into every role, and for god's sake he is a spartan, can he get any more cooler?

+Strong Early game
+Heavy Damage and CC
+His kit is easy to use
+E denies all the damage coming from enemies.
+Heavy roam champ thanks to his ult, you gain prescence on all the map and carry because of this

-Kinda squishy against magig damage
-extremelly vulnerable to CC
-vulnerable on late midgame, you get your last powerspike when you complete your build.
-Weak against heavy CC mages

As Pantheon, you must play really aggresive on early game, dodge stuns and go for the all in, always try to start trades with Emp W, this will proc PTA and you are mos likely to get a kill.

When you hit Lvl 3, you can start dealing full combos on your enemy laner, try to render him to half of his healthbar with your first combo, wait for your cooldowns to restablih, and go fo the all in.

If you get one kill, it's over for your enemy laner, for you can buy Dirk, which makes you snowball pretty strong from this, help your teamm with objectives when you get your ult, and always try to squeeze kills form botlane, for they are most of the time squishy and cannot sustain your damage.

--When 5 stacks of passive: Emp W + 3 AA's + Q + E + some auto's + Emp Q

--When 3 stacks of passive: W + 3 AA's + Emp Q + E