i live about an hour away from Stansted and use Ryanair frequently for day trips. (Excluding taxes, I've never paid more than �10 for a flight. Most flights have been less than �1).
Like all airports, car parking at Stansted is quite pricey although the long-stay rates are no dearer than most other airports. (Remember that the long-stay car parks are about 3 miles from the terminal. Get there in plenty of time to allow for the transfer on the shuttle bus).
There are good rail services to Stansted from London (Liverpool Street) and from the Midlands and East Anglia. There also good coach services from London but not from many other places.
Stansted Airport is a modern, attractive, well-planned airport. Like any big airport, there can be quite long queues to check-in on the most popular flights but, as long as you get there in plenty of time, that shouldn't really be a problem.
Some people don't realise how big the airport is and leave themselves insufficient time to get from the main departure lounge to the boarding gates. Read the signs telling you how long it takes to get there and then add some extra time on 'for comfort'.
Ryanair flights are scheduled to take off 25 minutes after they land. That means that boarding procedures can be a little rushed but passengers are usually split into two groups. (i.e. those who've arrived earliest, or checked in online, have the lowest numbered boarding passes. This group gets to board first [excluding people with disabilities or with young children, who get priority anyway] and, obviously, they find it easier to seek seats).
Personally, I couldn't care less if my flight had no seats and an outside toilet. As long as it gets me from A to B cheaply, I'm happy. I have flown with many airlines (including major scheduled airlines, like Qantas) and Ryanair is definitely my favourite airline because they're cheap, reliable and