Are polymorphic relationships bad practice?

I'm using Laravel and have run into the need to have something just like polymorphic relationships. It would seem that they solve exactly what I need, which is being able to store different data based on a type, in a nutshell.

However, I'm aware that I would not be able to use any constraints, like foreign keys. And I've read around that they're essentially an anti-pattern. But I was wondering what others think about it, and if anyone is using them without issues.

Otherwise, is there an alternative way I could accomplish what polymorphic relationships provide, without actually using them? (Using Laravel)

via Chebli Mohamed