On the original topic (can't help with gaming addictions), my other half was initially interested in my hams, and although he doesn't DISLIKE them, he thinks I had too many, he would watch them for me, and sometimes get them out of the playpen and hold them if I had to make a mid-playtime toilet trip. But for the most part, he's no longer actively interested.
I found that I caused this because I got too many hamsters, and he felt it was excessive. However I still get upset with him for not loving them the way that I do, (although he was upset + misses Sandy and Alfie).
So I know how you feel about the 'uninterested' thing, I know he sounds more interested than your OH, but given that the hamsters originally lived with him, it's quite a big change.
I hope you reduce the gaming thing