The comment was that they were delivered in the same condition as they would have been to a German frontline unit, and the Swiss found this unsatisfactory!
They mustn't have ticked like...a cuckoo clock!
In all seriousness, wartime combat aircraft weren't designed or built for the thousands of hours' of flying time modern aircraft do. Look at your local private airfield...you'll see 25, maybe 30 year old Cessnas and Pipers with thousands of hours on them. Period combat aircraft had VERY high performance engines, and strong but light frames of aluminimum and other alloys that readily stress-fatigued in high-g combat flying and engine vibration as fast as the engines wore.
Into that you have to add the terrible wartime manufacturing conditions in Germany, with simplified production for semi-skilled labour, and a variety of replacement techniques for impossible-to-source items like certain grades of ballbearings after the destruction of Schweinfurt. The Swiss tore the 109s down and "blueprinted" them, and IIRC they remained in service for another 15-20 years or so.