My kids and I loved this movie, so I was surprised to see the low rating on IMDb. The negative comments seem to center on three things:
(1) "Cultural insensitivity," chiefly for portraying 17th century turkeys like Indians. I don't get this one. They are put in opposition to pilgrims, who are trying to eat them, and the Indian association seems natural. (2) A "vegetarian" message. I am relatively sensitive to such message (e.g., I thought it was rather heavy-handed in "Jurassic Park"), so I can say that there simply isn't one here. It's about turkeys trying not to get eaten, not that people should never eat meat. (3) "disregard for time-travel paradoxes" (quoting from Wikipedia here). It's a movie about talking turkeys, and this guy is bothered by inconsistencies in time travel? If this bothers you, it's time to take off the bow tie and unfasten the suspenders, you need to loosen up.
Okay, the plot is not great, and there really isn't a message (at least not much of one). The joy of this movie and others of its ilk is in the presentation. There are a lot of funny lines, and the animation is amazing. I love seeing how cartoonists can elicit the most focused emotions simply by depicting a turkey's face.
If you are looking for a deep movie, this one is probably not for you. If you are looking for a great way to spend 90 minutes, you will enjoy this one.