Hi Welsh Dragon: YES ! -- It is unacceptable for NGC to encapsulate coins tilted. -- It is simply unacceptable and if NGC has a "Final Quality Inspector"
(as they proudly announce), this mistake should not be allowed to go through ... In fact, it is NOT a mistake, it is SLOPPINESS.
Further, for such a "serious, top-level grading house", they should be encapsulating with the Anverso of the coin matching with the Front Label of the capsule,
but not, and you get a series of coins (same type, different years) showing either the Anverso or the Reverso at the face of the capsule. This should NOT happen !
*** Anybody listening over there, NGC ?? -- Hello ! Hello ! Anybody there, NGC ?