In the end, opinions are subjective and there's no better way than for you to physically test the vehicle yourself. In general though, i've been pretty disappointed with the quality of cars churned out by Proton. Here are some of my experience with our national car. Am not going into performance coz the car was not built for that purpose:
Proton Iswara (1992 model, 2nd hand) - Probably the most durable of all my Protons. However I experience constant problems with the gearbox. I changed it twice. Interior was ok actually but the usual wear and tear occurs in quick succession which was quite annoying.
Proton Satria (1995 model, 2nd hand) - Fucking lemon man. The guy I bought in from didn't maintain the car and I rushed myself into getting a set of wheels. Constant bloody problems though it was probably down to a lack of maintanence.
After the above experience, I decided to get a new car instead:
Proton Waja (2002 model, NEW) - Within the first month, the glove compartment could no longer open due to the cheap cheap plastic they used. Never repaired it till the date I sold it (this year - 2005). Power Window broke a few months later. Was told that a new unit would cost RM 400 as you have to buy the whole set. I cried and the mechanic finally decided he could fix it out of pity for me. Absorbers conked out in 2004. Funny sounds began to surface late 2003.
In summary, I just don't feel that Proton produces quality cars. Perodua would be the better alternative and I agree with the posters that suggested you get a Myvi instead.
Alternatively, you could look to older Japanese cars like Toyota's or Honda's. Sure they're older but are more durable and longer lasting.