Too me it was too much of a reminder of the disfunctions in Washington--machinations for the sake of personal power rather than governing with integrity for the sake of the country. Call me naive. You said it well: the purpose of the show is entertainment. I guess I was not entertained.
I don't think you're naive at all. I think it's pretty clear that the politicians of today have completely lost focus on what's best for their district/state/country/etc, and have become far too focused on their own interests. So I'm with you on that one for sure.
And yeah, if you didn't find it entertaining it makes perfect sense why you didn't wish to keep watching. I don't know if it's of interest to you, but I also just finished watching season 2 of Homeland. It turned out to be a pretty entertaining show and focuses less intently on politics (although that does come into play a little).