The work won’t do itself, no matter how much you may sometimes wish otherwise. When that happens, you have no choice but to hunker down and get it done, especially if there are people waiting for you and/or you’re getting paid for the job.
The problem really is if the work doesn’t inspire you. That’s when you can get into trouble, because you don’t want to do the work. If the writing is mediocre or just plain bad, if the artwork seems to lack energy, if things just don’t seem to work well together, then when it comes time for you to do your particular job, it gets harder to do. It becomes a turnoff.
This is different from being “blocked”. If your creative juices are blocked, then you need to do something in order to remove the blockage. You might need to leave it alone for a while and come back to it at another time. Or you might need to find inspiration elsewhere. (I attended a convention once, and someone asked Chris Claremont where he found the inspiration for all of his stories. He said sometimes it was hard, and when that happened, he’d find inspiration in the mortgage, the light bill, or the grocery bill. We all laughed.) (And I put “blocked” in quotes because I don’t believe in a creative block. A creative block generally means you don’t want to do the work for one reason or another, and has nothing to do with not finding a way to actually do the work. If anyone tells me they’re blocked, I tell them they don’t want to do the work, or some other story is exciting them and they should do that work first and come back to this work.)
There always comes a point in time when you don’t want to do the work. Always. This is where self-discipline comes in. This is where being a professional comes from: doing the things you don’t always want to do, and doing it to the best of your ability.
Hunker down. Do the work. You’ll respect yourself for it, even if no one else knows it.