No.. I don't have a 500 but I'm looking at a few (the Younger Mrs S. wants to retire her Cinquecento) so I've seen good, bad and even a few ugly ones.
I'm still not convinced 500 is generically all that bad. I know a lot of people can get emotional as soon as their car develops some kind of problem and blame Fiat for it... but Fiat doesn't make the drop links for example... and the drop link doesn't know it has to go wrong when it's on a Fiat, but last for ever if it gets fitted to a Toyota..
Drop link is just a steel rod with a ball joint at each end. If the ball joint doesn't have dirt in it and it has a bit of grease added when it's manufactured (I guess the manufacturer doesn't leave the grease out, if the drop link is for a Fiat) then the only way it can wear out is by the number of up and down movement cycles, also bearing in mind the actual load on the ball joints.
I don't know why yours wear out. The exact same drop links on my Stilo JTD (diesel, so it's twice the weight of a 500) last 90,000 miles so something's not quite right with yours. I use TRW drop-links. I dunno if it's worth giving them a punt (cost more but last longer?).
The rear dampers I don't have experience of. Monroe is a budget brand so it's probably not a surprise that they don't last long... but I don't think the attitude of the damper is a problem... The Younger Mrs S. Cinquecento has 90,000 miles on her OE dampers and they are inclined at about 40 degrees from vertical.
It's more likely the 500 dampers have a thinner (cheaper) damper rod and can flex during its travel (all suspension travels in an arc) which would cause the seals to fail sooner rather than later. There probably isn't a "cure" since anyone making dampers for 500 will just copy the standard (e.g. if the problem is caused by a thin rod) design.
Top mounts, I dunno... I didn't see the design up close but I'll have to take a look. On the Stilo the bearing is part of a top-hat type of thing so it gets some protection from water and dirt.. and it also has a cap on top.. and it's inside a turret, so no surprise that they last forever maybe. Cinquecento just has a rubber "shower cap" thing on the bearing but again, they also don't sit in an area that can be flooded. I'll have to get more familiar with 500 top mounts by the sound of it.
Ralf S.