I created a PWE account and merged them without any problem. I wasn't going to do so until I read that it would eventually be forced on everyone, so I decided to just get it out of the way. Having to change display and account name was annoying, but I've never posted in their forums so the resetting of stats there was no skin off my back.
That said, it was one of the most hamfisted changes I've seen a company make. I can't believe they didn't warn the user base that it was going to happen.
Regarding the PUG issue above, I'd agree that the groups are lesser quality on the weekends, for understandable reasons. And I'm okay with that. There is very little real challenge in this game. Some of my most satisfying STFs were the ones that were successful even though mistakes were made, often by someone who didn't yet understand the method of beating the mission, and sometimes by a vet who hit the wrong button by accident and blew something up prematurely. Compensating for the miscues is fun to me. And sometime having to come out of your niche is a good thing. I feel a lot of satisfaction when I (in a fleet escort) am healing other people in an STF who are flying cruisers. Seriously, a lot of people newer to the game don't seem to know they can heal other teammates, and this is because STO does a poor on of educating a new player. I like helping them, far more constructively than many others do.
The only time I get peeved in STFs is when you have someone intentionally being counterproductive or abusive to the other players. That shit gets old real fast. And refusing to heed honest and friendly advice. It's easy to spot the immature folks.