Better than it has any right to be.
It's an odd film, is 'Deadlock'. It drags its heels pretty much from start-to-finish and can feel aimless at times, though to be fair it certainly does live up to its title. The performances from Mario Adorf, Anthony Dawson and Marquard Bohm are solid and are the main reason as to why I'm rating this as I am. The whole thing looks neat for 1970, too.
I can kinda see why others like this more than I do, but for me it falls short to what it was seemingly attempting to do. Location is cool, cover is ace, (much praised?) soundtrack is meh. Still, I'd class it as 'good' - albeit marginally so.