05 definitely gave us some great big matches. Just a shame I was completely disinterested with the product following WM until a few weeks before Survivor Series (Batista and Cena as champs really put me off the show, so much so that for the first time ever I stopped watching WWE voluntarily, and only got back into it before Survivor Series because I had tickets to a live Raw taping ).
Top 5 matches that year (off the top of my head)
Undertaker Vs Orton - Armageddon HIAC
HHH Vs Batista - Vengeance HIAC
Angle Vs HBK - Vengeance
HHH Vs Flair - Taboo Tuesday Cage
Eddie Vs Mysterio SD