Even though the bad script couldn't possibly get any worse but.....
There's definitely a few things that did not help this movie at all:
1) The wife = If they couldn't get Rachel Weisz to reprise her role (Which I can't blame her for not doing so), why get another celebrity to play the character? I mean in the first 2 movies, her character at least was important to play a role in. But her character was somewhat useless in the 3rd one.
Granted, the same can be said to the John's role, but at least he brought in some comedic effect to the movies.
But nevertheless, I just don't get why her character was even in this movie. I've really only seen this movie once in theaters because my bud wanted to check it out, which I regretted immediately mind you, so I don't really remember anything important her character had done.
2) Alex (the Son) = Correct me if I'm wrong but wasn't he around 8 in the 2nd movie? How in the bloody hell did he even get that old without Fraser looking much older or even aging that much?
Alex looked like he was in his mid to late 20's in this movie, so that means ROUGHLY a couple decades had passed. I'm sorry but I don't care whether if it's genetics or whatever, he does not look young enough to still be a teenager in this movie nor a guy in his early 20's. But yet Fraser's appearance hasn't changed much?!? Really?!?! How can that be?!
25 years old = barely passable, but definitely not early 20's. Fraser looks like he only aged a few years in this movie, sooooo...... Not saying he's a bad actor or anything, but major miscast there due to appearance.
3) Yetis = My brain wanted to blow up when they just suddenly showed up..... followed by a major facepalm.... Don't get me wrong, I like yetis (A LOT) but it just doesn't feel like a good fit for this kind of storylines. Or at least it shouldn't.