Yeah, it's always like this with a brand new product category unfortunately (the AppStore on ATV being the new product category.)
The apps will come, the vast majority of developers have only had a few months with the sdk for the Apple TV and few even got their hands on a unit to test on before the public launch last week.
Getting in at the start always has it's downfalls, but until more software comes and we get to see the true potential, I'm enjoying a few of the games available and that there's Apple Music access. I'm less fussed about the various catch up services getting their finger out and making apps, they will, but it's not like I don't have other ways to watch them in the meantime.
I was disappointed cause I could not find plex at launch, but saw in another thread that it's available now . If I can play media off my NAS through plex on the ATV that's a big move in the right direction . Going to give it a go this week .
Between the ATV and the fire stick I am in a good place .