Its not a bad scan. Your quality score dropped a bit because of the spikes in PI Failures near the end, but its not terrible. What speed did you record this disk? If you recorded at 16x, then these results aren't all that unusual. What you're seeing here is a little worse than my typical burns with TY02 at 8x or 12x.
I tend to pay more attention to the max PIF and total PIF score rather than the Quality Score, which can be skewed by single spikes in either the PIF or PIE graph.