Back in the day, this would have been a 10/10! But sadly, the show has been declining. They just didn't know when to pull out. The show peaked during the late 90s, but since 2000 it has been on a downhill slope getting worse with every season. The plots are dull and don't seem to go anywhere filled with awful jokes.
The jokes themselves are no longer original, but rather just follow the formula of older jokes and are written poorly. The voicework is still good, its just annoying seeing the same old jokes over and over. Homer is fat, Bart is dumb, Moe suicidal etc. Nothing is original anymore. And the wit is no longer there either.
The show was good in its prime, but it has taken a huge fall. The movie coming out doesn't help anything.