I love Jack Reacher (the character).
Lee Child's novels helped me to survive many a dreary day in the hectic world of investment banking so I was very keen to see this film and it totally met my expectations.
Jack Reacher is 6 foot 5 and Tom Cruise is only 5 foot 8 but that didn't matter; Tom Cruise did a good job of getting his body to look like a fit ex-veteran.
There were a few bits that were very far fetched, e.g. driving a car backwards at a very high speed and blending into a thin crowd when hundreds of cops were after him but this didn't spoil the fun.
My favourite part was when the old guy said, "sock it", don't worry, this knowledge won't spoil the film for you.
A few bits were a bit too 'boyish' for me, e.g. choosing to fight with hands when the gun he was already holding would have done the job a lot faster.
Conclusion: watch. This is definitely one to be seen in a cinema.