Strong start, limp finish.
I enjoyed the spy elements to 'The Eiger Sanction', sure it's a bit cheesy and could feel like a Bond knock-off in parts, but all in all it was cool to see Clint Eastwood in that role. Unfortunately, while I wouldn't say it's bad, the rest of the film focuses on uninteresting - due to how dragged out it is - mountain climbing.
It concludes with strong vibes of 1959's 'Third Man on the Mountain', a Disney film that is filled with mountain climbing. Like that aforementioned production, I didn't dislike what I was seeing but it's just not that intriguing to watch for an extended time.
I'm rating this 3* as it's still a solid film, with neat cinematography, but it could've been so much more due to what it sets up initially.