It depends on the person they are dating, their kids behavior & ages, and the single parent exes/extended family. The less drama there is in any dating situation the better it is.
In th past I have dated several women with kids. The women who dated for the purpose of enjoying a little adult time away from their kids were easier to date than those in search of a father for their children.
Dating is suppose to be a fun casual way for two people to get to know each other better. If things turn "serous" (naturally) overtime that's great. However trying to force something or dating "with a purpose" can push away most people early on.