I've seen those vids and still bought one. They are over a year old and MG has gotten better I think. Besides, if you watch the vids, even tho they complain (and I'll agree they have valid points, but the 2nd video guy comes off like he's whining and the 3rd? I don't trust people who keep birds as pets)...but even tho, they state the pipes smoke well.
And none of them state whether they contacted MG about the issue. If it was a big enough issue to make a video complaining about it, why not take a min and contact MG and see if they will make it right? I'll bet neither bothered....
Good pipes at a great price. If you are worried, check it carefully before smoking it and send it back if you find an issue.