I made the mistake of blind picking rammus (first pick). Little did I know the enemies had a vayne main, ahri main, and a janna main on the enemy team. All 3 have pretty huge counters to rammus. The enemy team also drafted trundle who steals my stats, making me less tanky, and zac is pretty meh into rammus.
We still won but I got carried by my duo hard.
Lesson I learned from this:
Do not first pick rammus