Just to clarify, the Airshow accident was not the computer's fault, the computer (alpha floor) function was not even activated during the pass. It was squarely crew error.
The 320 did have a bunch of accidents early in it's life, just because the air crews did not have enought experience with the equipment to fly it safely.
The B727 was in a similar situation when it first came out. Because of the advanced high lift device systems on the plane, it could develop a high sink rate that was difficult to arrest if the plane was not flown "by the book". This caused several 727 accidents on final approach. After airline crews learned to handle it, the plane became a blockbuster seller, much like the 320 story.
I doubt that there is any inherent problem with the 320 fbw system, otherwise I think we'd see many more 320s falling from the sky.
Just my 2c