The old Family Guy episodes are absolute classic. The new ones...Eh, not so much. They have a few gems, but there is just something 'off' about the new ones. Their joking timing i just all wrong. They either rush from joke to joke without pause (to let it sink in) or they extend the moment WAYYYYY to long. The old episodes had the perfect slight pause after someone said something ridiculous. The new ones either make light of this to an agonizing degree or rush to the next punchline. The one this past sunday was just pretty bad, i thought. I actually think American Dad has gotten really good. It was a little rocky in the beginning.
What is funny, to me atleast, is how many tastes have changed. When Futurama was on TV, I watched it sometimes, but didn't think too much of it. I thought Family Guy was light years better. Now, I actually prefer Futurama. There is more storyline, more going on, more to look at in the scenes, the jokes are usually a bit more subtle, but ridiculous none the less. It retains a higher rewatch value for me.
In short, the new Family Guy episodes are ALMOST on, just not quite right. Futurama is my favorite of the 3 and I can't wait for the new episodes/movies they're bringing out.
EDIT: ATHF: They're either sidesplitting or horrible. Nothing in between for me. Depends on the episode and my mood