Vault of glass was no problem. I never had a problem getting a group of guys that could finish a raid.
However recently 95% of the groups i've been in to beat Crota's End have been absolutely shocking. I'm not sure what it is, but the standard has been awful, most of the people i have played with seem A) Unable to think for themselves B) Unable to follow instructions Or C) Keep dying.
I normally do my raids early, then spend the rest of the week helping others. This week i've given up on doing it with my last character, as the quality of group has been so bad. It's got so bad i've had to ask for only people that have completed it (I've become what I hated) And then half the people are lying, and are unable to prove it!
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New raid means more time to perfect it. By the time VoG had been out for months most people new the proper mechanics. Give it some time and people will get better.