Originally Posted by Gojna
Rammus is considered to be "broken" because he outweighs the current meta-ideas people are trying to force onto Dominion. People seem to think auto-attackers are the way to go for the majority of the team's composition, leaving the one mage to hit bottom lane who will have little to no interaction with Rammus. Here's the thing; Rammus will ALWAYS dominate auto-attack champions. I've 5v1 as him and lived because the other team had 4 AD champions, all of whom died due to proper item purchases and some feeding. And that was on Summoner's Rift.
His speed with Powerball is impressive on Dominion, but this has more to do with the speed-boosts on Dominion than the ability itself. The only movement speed item he should buy is Force of Nature; anything else, especially speed boots, takes away his potential as a tank.
On the note of building him, here's something I've noticed; in the last five games I've played with a Rammus, one actually built him correctly for the enemy team. One of them literally bought five Zeals. While he was able to capture points and take on the AD champs, the AP champs on the enemy team slaughtered him quickly. Had they acted on his death more effectively, they could have easily taken a point due to his absence.
I'll end with this. Most of the people playing Rammus don't know how to play him effectively. Most people playing against Rammus don't know how to build a team comp or champion to counter him. Most people playing Dominion are playing AD champions, which even a terrible Rammus can destroy.
TL;DR - Throw a Morgana at an MR-less Rammus and see how well he does.
There's so much wrong here I don't know where to start.
Your profile shows you've played 47 games of Dominion and are currently 24-23.
Any team that picks 4 of anything (AD / AP) should lose every time. No questions. You counter-build defense, they can't touch your side, you win.
Auto-attackers are not "the way to go" on Dominion. This shows you're playing against bads. They probably ban Tryn.
Since these people are at best inexperienced, and more likely are bad, it shouldn't surprise you they can't build Rammus correctly for the situation. Kudos to you for seeing this problem, you're already one step ahead of the game.
On your fourth point, people don't know how to play Rammus effectively from your perspective because they're bad.
TLDR - you're playing against bads.