Speaking to What's On TV, Morrison explained that he likes seeing how Will has reacted to his divorce from Terri (Jessalyn Gilsig).
"Actually, I love his faults," he said. "Especially after getting divorced and everything there's been a lot of figuring himself out as a newly single person.
"Because he was with Terri since high school - they were high school sweethearts and that's kind of all he knew. And so there's a whole getting to know you process again of a newly single person. So it's been fun to explore that and to figure out what that is for him. And he's making a lot of mistakes, which I like. He's not perfect."
However, Morrison also revealed that he is not so keen on the costumes he has to wear on the show.
"Like, the sweater vest thing I'm over," he joked.
Glee returns for a new episode in the US on Tuesday at 8/7c on Fox. The show continues in the UK on Mondays at 9pm on E4.
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