Well I must say I rather enjoyed it (though I'm not sure "enjoyed" is the right word), though it is (perhaps expectedly) something of a tear-jerker, and a little depressing.
Not an action film by any means, probably about a minute's worth of action in the whole two hours. Us Brits don't really do action. A moving emotional drama, then, but no real surprises.
The Great War was beastly, awful and unfair, and there can never be enough tears to shed over it. I think we all knew that fact anyway, but I suppose it doesn't hurt to be reminded of it every now and then.