I would the ask whether there is any module that can replace xcGallery?

If you already have a big gallery in place, I really don't know if you would want to switch. Currently I am using XoopsGallery (http://www.xoopsgallery.org) and I have no complaints. When I tried updating to 2.2, I lost some info from it, then I reverted back to 2.0.13 and had to fix it. Didn't take that much effort...all I had to do was rebuild the MySQL DB from a dump I had made. All is well now after about 5 mins of work. I would recommend XGal to ANYONE!