Ok, here we go:
I worked with the largest automotive company for almost 10 years, right after college. I also had to deal with union people so I know a few things first hand (not heard from dad/uncle/brother/the man behind the tree/etc.). I don't know about other unions such as the IBEW so I won't comment about them but I know a thing or two about UAW.
1. True. Everyone agree that unions did many good things back then, fought for 40 hrs work week/better conditions/etc. No one will dispute those at all.
2. FAULT. Maybe it is true in your area/work but not here. I worked along side with UAW folks on the assemly line and I will tell you that over 90-95% of the jobs can be done by anyone that can read/follow instructions. Yes, there are a few jobs that require skills such as bodyworks, repaint to name a few but to say you can't get your projects (large,medium,small) done WITHOUT unions are full of BS.
3. UAW members will able to transfer to other plants and get pay the same or better if he or she is working on the same job class. UAW important word is SENORITY. If a moron with higher senority, he can pick and chose the easiest job over a hardworking guy.
4. Better pay, yes. Better work? LOL.... we all know how well domestic vehicles are made. No further comment needed. Are they better than they used to be? Yes, they have no other choice but go up. But is it as good as imports? You tell me. GM used to have over 50% market share in the US. How much is it now? Less than 20% IIRC. Domestic makers are losing billions while Toyota/Honda and the likes are making billions WITHOUT all the gimmicks like rebates.
Unions benefit all involved? LOL. Sure if you like to deal with arrogance, lazy, incompetent,
"It is not my job/Call my union rep/I will write you up because you pick up a piece of trash off the floor (I supposed to call the environmental guy to pick that up and shouldn't do that by myself)/Mangement is out to screw us (because we asked them to pay a few co pay dollars for their extreme generous health benefits).
Now I am not saying ALL UAW members are like that. Some of them are hardworking and nice. I would say about 10-20% of UAW at my plants can compete with anyone, but the rest of them? I will say good luck.
If UAW is so good and so strong, look at the last contract they signed with the big three. You make the call.
Last but not least, unions numbers, especially the UAW, are going down. IIRC, UAW numbers used to be over 1 million, now I believe it is around 250K or less.