Mudbox is just a really nice and well designed application. If you know Photoshop you will pick up Mudbox straight off the bat.
It's not as powerful as it's contender Zbrush in absolute terms, the ways you can edit geometry in Zbrush far out-perform Mudbox.
Also the complexity of geometry Zbrush can handle before losing performance is much higher than what Mudbox can handle.
Depending on what you do you may not need the power of Zbrush tho, like perhaps if you only need 10 million polys for your sculpt, not 50.
And not hating your life and the application you make your art in can have a positive effect on the quality of your work and your work ethics.