Around about 65-70 per cent, I reckon. Tops. Because you can't tell me the developers were finished here.

The film's out this week, so Mr Angry Studio Marketing Man (we'll call him Chad) obviously got out a big stick and beat the designers to death, prying the incomplete software from their cold, dead hands.

Characters run with all the elegance of 17-legged ostrich wading through chutney, I lost count of how many times Kirk got stuck on nothing in particular, and our generic alien nasties are animated with all the panache of a porridge toilet.

And objectives really aren't clear. "Go here and do that," suggests my pointy-eared friend.

What? Where? And how do I do that? Oh you're not going to show me. Swell, thanks.

I like the films, I really do, but Chad, mate, be patient next time.