I think having a rank for tactics trainer would be cool

I want to see how my score compares to others.

also cool would be chess mentor

i agree. I think that before a game can start, one have to complete a random tactical trainer puzzle. Everyone will have a baseline tactical rating. This rating will give any opponent an indication of your insight into the game. 

It would be a great surprise if someone with less insight to win someone else with a greater tactical experience. 

Do you mean something like this:

• http://www.chess.com/tactics/players
• http://www.chess.com/tactics/players?name=MrMars

?

i do mean something like tha shakaali. but rather an actual numerical representation on it. like it can be on their profile so and so is ranked number x/y on tactics trainer...