Keep in mind that a speck of dust on the disc can generate a spike on a quality scan. Generally speaking, single spikes of that magnitude are not significant, and may not be consistent from scan to scan. Larger areas of errors on the disc can indicate a media quality problem or a burner's burn strategy problem. They also create trouble with read-back on some slim-type drives used in set-top players.
This is an example of a disc that one might wish to avoid.
That first burn of yours is far from terrible. If a transfer rate test shows no read-back slowdowns, I would not be too worried. As I said, keep an eye on your subsequent burns with this media and burner before you decide that either one might be a problem :).