To be fair, it was a cut above the preceding episode. The Unit is very good at coming up with promising story arcs then dropping them or messing them up. So we had Bob's forced addiction to heroin earlier in the season, yet through sheer force of will, he manages to cure himself in between episodes with negligible effects.

Towards the end of the season, we had new Unit member 'Whiplash' turn stalker, try to rape other new Unit member Bridget, try to escape custody and then get recruited by terrorists. Okay, so all a bit escapist, but the sudden revelation he was undercover the whole time - even when trying to rape Bridget - was just ridiculous, particularly since he could have been killed dozens of times by other Unit members while establishing his cover. But with that a given, his integration into the finale worked reasonably well, although only if you turned your brain off a little.

The season's story arc - a plot to assassinate the president - which started off as a gutsy move (Venezuela and Russia, rather than some fake Arab countries, are fingered as the sources) just seemed to peter out, with a plot to set off nuclear bombs in four cities around the US foiled in about 20 minutes with minimal action or effort required on the Unit's part. It was tense, but with no surprises in store, ultimately predictable.

While there are some interesting threads left in play, this was something of a miss as finales go, unfortunately. The Unit, if it does come back, really needs to work out what it wants from life. Does it want to be a thrilling look at the army, a not quite so thrilling look at spies or a slightly duff look at army life? Does it want to go with the full force of its conservative convinctions or does it want to have the safety catch permanently on?

For this fourth season at least, while it's had some good moments as well as some fun and escapist moments, it's been stuck uncomfortably between various stools. Time to pick a side, guys.