To add to the fine work of Joetidman, I thought I would compile a list of A3 reviews and videos to help those out who are considering buying one.
Audi A3 3 Door Hatchback
AutoCar Audi A3 Review | Autocar
Carbuyer Audi A3 hatchback review | CarBuyer
Whatcar Audi A3 Hatchback Review | What Car?
Audi A3 Saloon
Auto Express Audi A3 Saloon | Auto Express
Carpages Audi A3 Saloon Review (2013)
Autocar Audi A3 Saloon Review | Autocar
Honest John Audi A3 Saloon 2013 - Car Review | Honest John
Auto Trader Audi A3 Saloon (2013- )expert review
Audi A3 Sportsback
WhatCar Audi A3 Sportback Review | What Car?
Honest John http://www.honestjohn.co.uk/carbycar/audi/a3-sportback-2013/
Parkers New Audi A3 Sportback (13 on) Review - Summary | Parkers
Kelley Blue Book Kelley Blue Book
Audi A3 Sportsback Quattro
carsGuide Audi A3 Sportback quattro review | carsguide.com.au
evo Review: new Audi A3 TFSI quattro | EVO Magazine
Audi A3 cabriolet (not released yet)
AutoExpress Audi A3 Cabriolet 2014 review | Auto Express
What Car 2014 Audi A3 Cabriolet review
Audi A3 e-tron (not released yet) <-- very interesting car!
cNet Audi A3 Sportback quattro review | carsguide.com.au
autoblog 2015 Audi A3 Sportback E-Tron Quick Spin - Autoblog
Drive.com.au (with video) Audi A3 E-Tron review
Comparisons
car (Golf, A3 and MB A series) VW Golf vs Audi A3 vs Mercedes A-class (2013) CAR review | Road Testing Reviews | Car Magazine Online
topCar (A3 1.8 and BMW 125i) Audi A3 1.8 TFSI quattro vs BMW 125i | TopCar
Videos
Car Buyer - Sportsback Audi A3 Sportback (hatchback) 2013 review - CarBuyer - YouTube
Car Buyer - 3 Door Audi A3 hatchback review - CarBuyer - YouTube
Auto Express - Saloon Audi A3 Saloon (sedan) review - Auto Express - YouTube
What Car - Saloon 2013 Audi A3 Saloon review - What Car? - YouTube
What Car - Sportback 2013 Audi A3 Sportback review - What Car? - YouTube
What Car Group Test (A3 SB, MB A Class and VW Golf) 2013 Audi A3 vs Mercedes A-Class vs VW Golf Group Test - What Car? - YouTube
MotorTorqeUK - 3 Door Audi A3 review and road test 2013 - YouTube
Motormouth Canada - Cabriolet 2014 Audi A3 Cabriolet review - YouTube
Drive.com.ua - A3 e-tron Audi A3 E-Tron Video Review | Drive.com.au - YouTube
And Finally....
Link to S3 reviews http://www.audi-sport.net/vb/new-a3-s3-8v-chassis/205548-s3-reviews-collection.html
Let me know if you have others that you would like me to add.
Audi A3 3 Door Hatchback
AutoCar Audi A3 Review | Autocar
Carbuyer Audi A3 hatchback review | CarBuyer
Whatcar Audi A3 Hatchback Review | What Car?
Audi A3 Saloon
Auto Express Audi A3 Saloon | Auto Express
Carpages Audi A3 Saloon Review (2013)
Autocar Audi A3 Saloon Review | Autocar
Honest John Audi A3 Saloon 2013 - Car Review | Honest John
Auto Trader Audi A3 Saloon (2013- )expert review
Audi A3 Sportsback
WhatCar Audi A3 Sportback Review | What Car?
Honest John http://www.honestjohn.co.uk/carbycar/audi/a3-sportback-2013/
Parkers New Audi A3 Sportback (13 on) Review - Summary | Parkers
Kelley Blue Book Kelley Blue Book
Audi A3 Sportsback Quattro
carsGuide Audi A3 Sportback quattro review | carsguide.com.au
evo Review: new Audi A3 TFSI quattro | EVO Magazine
Audi A3 cabriolet (not released yet)
AutoExpress Audi A3 Cabriolet 2014 review | Auto Express
What Car 2014 Audi A3 Cabriolet review
Audi A3 e-tron (not released yet) <-- very interesting car!
cNet Audi A3 Sportback quattro review | carsguide.com.au
autoblog 2015 Audi A3 Sportback E-Tron Quick Spin - Autoblog
Drive.com.au (with video) Audi A3 E-Tron review
Comparisons
car (Golf, A3 and MB A series) VW Golf vs Audi A3 vs Mercedes A-class (2013) CAR review | Road Testing Reviews | Car Magazine Online
topCar (A3 1.8 and BMW 125i) Audi A3 1.8 TFSI quattro vs BMW 125i | TopCar
Videos
Car Buyer - Sportsback Audi A3 Sportback (hatchback) 2013 review - CarBuyer - YouTube
Car Buyer - 3 Door Audi A3 hatchback review - CarBuyer - YouTube
Auto Express - Saloon Audi A3 Saloon (sedan) review - Auto Express - YouTube
What Car - Saloon 2013 Audi A3 Saloon review - What Car? - YouTube
What Car - Sportback 2013 Audi A3 Sportback review - What Car? - YouTube
What Car Group Test (A3 SB, MB A Class and VW Golf) 2013 Audi A3 vs Mercedes A-Class vs VW Golf Group Test - What Car? - YouTube
MotorTorqeUK - 3 Door Audi A3 review and road test 2013 - YouTube
Motormouth Canada - Cabriolet 2014 Audi A3 Cabriolet review - YouTube
Drive.com.ua - A3 e-tron Audi A3 E-Tron Video Review | Drive.com.au - YouTube
And Finally....
Link to S3 reviews http://www.audi-sport.net/vb/new-a3-s3-8v-chassis/205548-s3-reviews-collection.html
Let me know if you have others that you would like me to add.