An American Carol might be the exception to that rule, but even it is very heavy handed.
I have discussed several times the sheer quality of the programming on HBO, and Game Change is no exception. The story of Governor Sarah Palin's rise and fall during the 2008 Presidential Election is an amazing rollercoaster ride, and by amazing, I mean it in both the good way and the bad way. The film does well in showing that, we see the good and the bad, but sometimes, just sometimes the humor in the script can be quite cruel. I think that was a bit unnecessary. It's all about show don't tell, folks, I think we all know what kind of person Sarah Palin was during the Election.
Other than Woody Harrelson, who I have trouble keeping a straight face whenever he's in a movie, the cast is first class. Julianne Moore is great as Palin, except when she goes over the top, which is thankfully not often. Ed Harris and the rest of the ensemble cast turn in admirable performances. Well worth watching, just don't take it, or your own politics that seriously, when you're watching it.