Pantheon is not always a safe pick in the mid lane and won't work against certain bot lane combinations. Pantheon is mainly valuable because of his CC and engagement tools, making him valuable and an efficient pick as a support. He will lose out on damage, but the CC and engage will remain.

Why is Pantheon support good?

Pantheon support has regained popularity during season 10, and especially so during Summer Split in professional play. Mostly seen as a top lane bruiser, Pantheons point and click stun, ability to tank tower shots and solid burst DPS, has made him a surprise cheese pick in the bot lane.

Is Pantheon support bad?

Pantheon is usually known as a solo mid or top laner, but has slowly been shifting towards an aggressive support. ... The base damage is what makes Pantheon a scary support in the early game, since no support or marksman can compete with his damage output in the first few levels.