I'm glad I amaze you I never said a car will be reliable because it has a warranty but that I need a reliable day-to-day car. A car backed by a warranty will mean any repairs will be carried out FOC at a main dealer and I'll have a courtesy car for the duration. I would wager than most new cars are more reliable than 3+ year old ones however, or manufacturers would be offering longer warranties on their cars....
That has happened! The Bravo has a 5 year warranty, and all Hyundais have a 5 year unlimited mileage warranty IIRC.
The cost of a few repairs is nothing compared to the cost of replacing a 3 year old car, you must loose £1000+/year for the first 3 years on depreciation alone. At 3-5 years you shouldn't need to replace anything other than consumable parts, although even then it depends on mileage and how it has been driven.