No, just because your dogs live outside doesn't make you a bad owner.
It's all about HOW you spend time with them.
If you want your dogs to live outside, you need to compensate for the time they can't spend inside. Even if I'm sitting on the couch watching TV, my dogs are still around me. They crave this attention, and it's time being spent with them. Dogs NEED human interaction and stimulation.
Outside dogs can't get this attention constantly, so they NEED to be taken off their chains/kennels for human interaction. It doesn't matter if it's raining, snowing, you've had a long day at work, you'd rather sit inside and chat online, etc, etc. Your dogs NEED interaction.
Your yard is muddy? So what! Strap on your big girl boots, wear pants you don't mind getting dirty, and take the dogs OUTSIDE of the muddy yard. You think YOU don't like crossing through the mud for the dogs? Imagine how THEY feel spending 24 hours without human interaction. If you truly ARE trying "your best" to get them out of their pens, then they'd be OUT OF THEIR PENS. Obviously you're not trying your best if you can't even PLAY with them daily, let alone take them on walks.
If you can't get them their shots on time, bathe them, or feed them a decent food, I'd strongly URGE you not to add another dog. A CC stuck in a pen with no interaction isn't going to be a welcoming sight.