It pretty much is all their fault.
Their poses are crap, their human face models are crap (besides a few here and there) and they continue to ignore characters the fans want. No one asked for a 3rd Boba Fett or now a 3rd Darth Vader. People have been asking for Lando, Qui Gon, EP3 Obi-Wan, Tie Pilot and many others. A few redos like Anakin Skywalker, Count Dooku, Clone Trooper etc would be acceptable as well.
And when they do give us the characters we've been asking for (Bespin Luke, new Han Solo), they look like garbage. I have no interest in a Han Solo that doesn't resemble Harrison Ford or a tap dancing Bespin Luke. I'm not paying $500+ for crap and those 2 pieces are crap. Who approves these things?
I could forgive them introducing a RO Darth Vader (its Vader and is a money maker), if it actually was a RO Vader, the base is off, the pose is silly and seems to be based more off ROTS Vader than anything. Why would people purchase this when the far superior Iron Studios Vader is out there? Not to mention they just raised the price for their ROTJ Vader and that is still sitting in their warehouse.
Besides Leia, I don't have any interest in anything Sideshow is doing with Star Wars right now, between their struggles here and their awful "Sideshow inspired" comic statues and constant rehashes in those lines, my money will be going elsewhere like Iron Studios, Prime 1 and Hot Toys.
They need to get their act together.