I think all mothers rock. Single. In a relationship. Married. Lesbian. Straight. Bi. Blue. Green. Purple. You get the idea.
The only thing that really matters is that they love their children and do their best to raise them to be honest, kind, and respectful of others.
Truthfully, I’m a bit in awe of single mothers because I don’t know how we do it sometimes! Being a mama is hard enough when there's a daddy around to help out. Not to toot my own horn, but we women who carry that responsibility all on our own are a special sort of superhero. IMHO.