No tank is too strong or too weak, just depends on how you use him, that applies to every ninja on your roster.

Roshi is a scale up tank, no way Kimimaro is better than him or vice versa, maybe you're using him with wrong lineup, some ninjas shine with the right lineup.

Let me give you a perfect example, since people are making lightning + tendo, you know why they use gakido and not asuma wb? 1st tendo mystery is not prompt, 2nd gakido is a defense ninja that would avoid either someone killing your tendo or main, and 3rd it's just an easy way out for people who dont wanna bother making original teams, that's why it's called meta for a reason, doesnt have skill involved.