The thing is, even if it's not worth it, it might be your only option. If the Katarina turns towards you while the Rammus/Nautilus/Alistar cc locks you, you're probably going to die instantly, assuming the Rammus/Nautilus/Alistar can't 1v1 you, which they very well might be able to do. Surrendering yourself to the cc is seldom the best option.
If you are absolutely certain they have no cc left, then you might find it worth sliding past them with less time-consuming care, but only to rejoin your team, because once their cooldowns come back up, if you don't have your team between you and them, things can get messy.
An adage from my friend who introduced me to league: "If you can't help, don't bother trying." Sometimes "abandoning" your team is the smartest option. Of course, this is a team game, but fighting the Rammus/Nautilus/Alistar is all you can do. At least you're keeping it a 4v4 instead of a 4v5.
Then again, every game is different. How far behind the Rammus/Nautilus/Alistar the teamfight is happening, how practical it is to take alternate routes, and how much you can impact the fight are all things that will need your judgement to determine the best course of action.