Those photos clearly aren't horrible. From what I've been reading though (not a personal owner of the N5 myself), the biggest issue is with autofocus lag, and thus affecting photos with motion more significantly--something you obviously wouldn't have had a problem with considering these are static shots (or nearly so, save for a kitty's tongue ).
Again, don't have any personal experience so I'll defer to Nexus 5 owners who can provide first-hand experience and will surely correct me if I wrong.
BTW, that Kimchi pot has my mouth watering--looks tasty.
The 4.4.2 update fixed a lot of that. It snaps the pictures faster and it focuses faster and i hear they are still working on an update to improve it even more. The camera on this Nexus is the first one that has a good one.