Alone I have no problems. The companions are just fun to take along.
Yup....that's it for me too. I can solo the game just fine...but after that, I just find the game more entertaining with them along...watching them whup ass all over the place. Make me smile.
I stuck with Boone for most of my game. In fact, I've only started taking other companions along now that I'm level 30 (for some time now), have explored the entire Wasteland, and have completed much of the game quests. Really, I want to finish their side quests, and I want to see what kind of perks I get from each one in combat. That way, I can make a better decision when it comes to taking down Caesar and his minions.
I know this is an older reply, but I wanted to mention that if you've already done many/most of the quests in the game before you hire any companions, chances are high that you'll miss being able to do/see all their quests because of the way they're designed.