Those were pretty dark days from Chrysler, I'd stay away.
As for rentals, I feel better about them than buying a car off lease. At least the rental got maintained properly, and the vast majority of folks don't beat the snot out of them. I'm more wary of ex-lease cars as I know plenty of people who perform zero maintenance on them ("Why change the oil? I'm getting rid of it in two more years?")
My grandmother got one that was a POS in the early eighties, but it wa a 79 Malibu and most of it's POSness came from GM, not Enterprise.
All other ex rental owners have been quite happy. I have 36K on my ex-rental with just an ISS replaced under warranty (again, a GM problem, not an Enterprise problem). I got it with 23K.