3 door does look better, only people with 5 doors think they look the same
3 door simply look curvier and more "sporty" as a result.
I totally agree - and you're right in that its always people who have 5 doors says it looks as sporty. If it did, all VW's press release photos for the R and GTI would be 5 door - but they're not!
The Golf is a great compromise for people who need back doors but want a hot hatch. Look at the Astra, Civic, Clio, Megane etc - none of these even have an option as a 5 door in their sports model... and the S3 has only introduced the 'sportback' version (which looks like a small estate car!) in the last year.
3 doors for me... but then my back seats are used a handful of times a year!