If you really enjoyed meet the parents and meet the fockers, as in, watched them more than a few times, I suspect, Like me, you will be more forgiving about the failings of this one than most.
Its not a complete failure...there are some solid gags...just not enough of them really- and not as funny, as in the first 2 films.
Having said that, I enjoyed the film... perhaps its the strength of the cast (they manage to retain the main stars of the 2nd film)that made it enjoyable, rather than the script... De niro and co made a few jokes funny that perhaps weren't funny in the first place.
The title is also very misleading, as there is barely any jokes involving the kids in the movie...In fact the "meet the fockers" movie, had more..
It should be called something else...(you will know the name if you watch the film....or look at the picture on the dvd, and you might guess!)
If you liked meet the parents, and to a lesser extent, meet the fockers...you will like this to a lesser extent again. But I have to say, Its still not too bad, just could have been better...
Also, the extra features include an alternate start scene, which I feel is much funnier than what they went with!