Jack and Karen from Will and Grace is a great example because while I like the show, it would have been improved if neither Will or Grace were in it.
How I Met Your Mother is another example because Ted is actually the character I care least about, it's Barney, Robin, Lily and Marshall that get the best line and situations.
There's actually an episode of CSI written by Chuck Lorre which is a hidden stab at sitcom divas like Cybill Shepherd.