I thought that Thor/Enchantress pack was the weakest of the wave as well. I think if anyone decides to get into the line at this point, or later, might be better off anyways. Although I picked up a fair amount of the figures from the first year, I can't say that any of them were all that great overall. The newer stuff is much better quality, along with the Iron Man line. The first year's releases really seemed hit and miss though, and many of them are really "loose" in the joint department.
That's also something I've noticed with the older Toy Biz Legends (and I think Brent mentioned it once as well). I was re-arranging those a couple of weeks ago, and a lot of them are tougher to keep standing now it seems. Some were always that way, but they definitely aren't the most sturdy figures in some cases. I can't imagine what those would be liked for kids who actually play with them, but that could probably be said for a number of toys.