I've been down this road. I got a replacement Wolverine after 6 months. The production on this run was totally different including not only the the shape of the joints that connects together but also the weight in things like the base and head. The way that the statue fits into the base is totally different. The magnets were a lot stronger and the joints were far more uniform. Be warned, I tried to use replacement parts on my faulty first one, but they did not work because each joint was unique. This may have changed in the next production run.
My replacement also has the back footprint issue, no lean though. The back footprint issue is a result of the change in the way the statue sits into the base and I think you'll only find it in the later runs. The magnets are far better however, and provided it doesn't come with a lean already, I doubt it had the potential to topple because of the way it's inserted. Nonetheless bloody annoying QC issues again from SS. Sideshow said the others were the same when I asked for a replacement because of the footprint issue. Typical of them. Do they even care anymore? I note they never comment in the forums on QC like XM does. I'll be keeping mine for now - seeing as it took 12 months to recieve an 'almost as advertised' I paid for.