Had a W 206 Gti (140).... it RATTLED BIG TIME (after covering about 65000 miles)...
My new 182s covered 10.5k so far, and does rattle a tiny wee bit.
Been in a W 172 thats covered 50k, and it was fine... but prices have dropped since then. Maybe cheaper production methods mean cheaper car, and less quality? Who knows?
As for engine noise... the Gti IS the noisier car, despite the 182s new zorst system.
And miscellaneous... Well, my Gtis spoiler came off in a car wash, after only having it a week... shouldnt have happened really... so beware!
Also, difficult to judge where the wheels are on the Gti... my wheels got seriously scuffed! No damage to my 182 so far...