New Vinyl Defects

I'd like a little input from you vinylphiles out there.

My buying recently shifted back to almost exclusively vinyl rather than CD. I'm buying mostly "pre-owned", but recently purchased an armload of new and 180 gram pressings. A recent order of 4 LPs, 2 of them were defective. One is unplayable - it had label glue on the last track, and (this is the really odd part) the grooves were off-center, so much I could see the tonearm oscillating back and forth, and the sound was also oscillating. The other one wasn't so bad, or unusual, the first track had near-constant "scratching" sound for nearly the whole song. I recall this as being pretty common in "my before cd" days, but assumed with 180 gram LP's that the QC may be better.

Here's the questions:
1) is the above unusual? That is, is 50% defective - common, or anomaly?
2) What's the likelyhood that if I send back the second LP (Johnny Cash "American V: A Hundred Highways") for a replacement, that I'll get a good copy? I like it and will tolerate the first track if they're all bad.