Rammus?

Rammus is a good jungle, he's currently on the rise. If you want a tank champ that's strong right at this very moment you can try out Naut.

Depends on where you're playing him. Like Sir ArmaMalum said, Rammus is a good jungler, but he can also be played top lane in a pinch. A problem with Rammus is that he's countered by Mikael's Crucible, but usually people at lower elo don't use this item too effectively in my experience, so I think unless you're playing in Diamond/Challenger, you should be okay. If you're looking for pure tanks, Mundo and Malphite are also pretty good, can also double as junglers if you want.

atm me personally, top lane I play Malphite tank and Amumu in the jungle.

Rammus is one of my favourite tank champions, I definitely recommend.

He can take it like no other tank can, but he can't really do any damage like most other tank champions such as Vi. If you want a pure tank go for him, but if you want someone that can do well in something other than tanking then I'd say it's not the best option.

Ok.

just a few that are good

hecarim. he is vastly underrated as a champ. he has, in my opinion, the best escape, best initiation, and with tri force in ur build (optional) is one of the toughest bruiser junglers.

also warwick or udyr is a good option.

if your wanting a top lane tank i would go with darius nasus or renekton

I've played only rammus for the last 4yrs, rammus is a gimpy champ and not worth much after 5.2, There are better tanks that have more offensive abilities and can do the job tons better than rammus. Save yourself the cancer causing pain and play something that's fun and not gimped like rammus.

Rammus is junk now, where is coronach when you need him!

Rammus is good within his specific niche. Even though Rammus brings some AoE damage with his ult, he is primarily about singling out individual targets. He is basically a hard counter to hypercarry AA-ADCs (the more they rely on AAs, they will typically have higher AS and high AD/Crits, which means more damage for you to reflect back to them with your Taunt/Shield/Thornmail)

However against ADs that are more ability based or do mixed damage (such as Ezreal) he is slightly less effective. And since he really wants to build armor, he has to choose to either get blown up by their APC or build some MR and lessen his counter to the ADC.

Rammus is also a very old champion (one of the Originals) so overall he's just less... I dunno, fancy? Than the new champions. Early on they balanced more around numbers than mechanics, since their abilities were much more limited than what they can do today with their coding and programming.

So if you want to be a single-target, Fuck You tank, Rammus is great. If you want more of a wide area, team-disrupting, "LEROY JENKINS" kind of tank, then someone like Naut or Zac brings a much stronger AoE presence and can disrupt the entire team instead of one enemy.