You can always edit your profile, and should as you're impression changes. But I wholeheartedly agree that the ratings as presently configured are pretty unreliable as a guide for a new buyer.
Case in point- new registered owners who give their cars ALL 10s!!! before they have even taken delivery. How would they know? Remember Dale Farmer? His car was ALL 10s!!!, until he got rid of it, when it became "a piece of #%^* from day one". Do I really care what someone like that thinks? I'm a really picky guy- my 8 is another man's 10!!!!!- is everyone on the same page with the ratings? Perhaps at renewal time for your contribution, the slate ought to get wiped clean, and a guy could re-evaluate his ratings. Some rating for mechanical reliability would be good too, although the rating would be skewed by expectations. A VW flat 4 with solid lifters is not going to be as maintenance free as a Honda (or Subaru- Johnny 2 bolts)
That brings up another point- how am I going to compare a pan-based car to John H's subi-tub? I may as well compare my daughters Miata to my Speedster- they really are two different cars. Let's see, how to compare a mid-engined, water cooled, rack and pinion cabriolet with an air-cooled, rear-engined, VW motored, pan-based Speedster. Well... they both have 4 wheels and some porsche badges...
The bottom line is- visit the builders, or go to a show and check out the cars from various builders. You'll have a much clearer impression of each of them after looking at a couple. I'm happy with the choice I made, but I got lucky- I had ZERO frame of reference.