Look at the facts - they are the most on time airline in Europe, loose the least bags and have rock bottom fares, with new a/c!
According to flightontime.info, Ryanair, using data recorded by the CAA at UK airports, ranks Ryanair 12th for on-time performance during 2006, with 70% of flights arriving on time. Flightstats.com rate them at 74% on time for Feb and March 2007, on routes between UK and Ireland.
Clearly, with the bulk of their flights operating to/from Ireland and Britain, these figures suggest their claim of 99% must be inflated.
Their baggage statistics are unsubstantiated as they do not report these figures to the AUC or anyone else. Personally I don't believe their 'results' are as good as they claim - a factor of ten less than the best reported by the AUC? (FWIW, Virgin Atlantic, bmi, Cyprus Airways, Aer Lingus, JAT Airways, EasyJet and Olympic do not report baggage loss stats to AUC either). That they dare to claim the AUC has actually confirmed them as No. 1 is not only wrong but simply makes any of their other claims suspicious IMO.
There are plenty of online articles from last October and November reporting that Ryanair is most complained about airline in Europe, one article even stating that baggage mix-ups and flight delays were the cause of most of the complaints.