How can you say they were "screwed over" when they won 4 championships together? It seems like you're putting a ton of stock in repeats, but...keep in mind, they only lost 2013 due to a bizarre series of highly unlikely events. If the ball bounced in a slightly different direction (not directly to Ray Allen), that was a repeat.
They also lost 2006 in a rather bizarre fashion. happens. The Spurs have had a lot of unfortunate things happen to them, yet they still walked away with 5 rings. I feel your pain that it could have been 8, but that doesn't mean the whole thing was disappointing!