The Airfix Panther and Tiger
The principal faults are the thin barrel, the poor detail on the tracks and the positioning of the roadwheels. Built from the box the vehicle looks as though the suspension has failed - see Nostalgia. This kit has been overtaken by some more modern plastic kits, and there are some excellent resin versions on the market.
This kit is also showing its age in places, but it has virtues - notably a really businesslike barrel and good representations of the late-pattern roadwheels. For the beginner the chief difficulty, perhaps, is the turret. It is hard to build the turret walls so that no join is visible at the back. One solution is to add a turret basket, which ideally should have come with the kit.
But what to do with the tracks? The Panther's may be crude, but at least they bend easily. The Tiger's are massive and very hard to handle. On these models, made by a beginner, the method used was to stitch them with cotton. Bits of matchstick under the overhang create the sag.
Close inspection of the Panther shows the first signs of the other dreaded problem of vinyl (or whatever they are) tracks: rot. This is why they should not be fixed under too much tension. It can take over 30 years for them to collapse, of course. Or you can get the same effect instantly using superglue....