Is my Old Apple TV still any good?

If it were a 1st gen then it no longer has access to the iTunes Store and syncing was removed from current versions of iTunes. If it were still in working order you would be able to play media already stored on it, and if you had a backup of an older iTunes you could revert to continue syncing. It is considered obsolete though so once it stops working there isn’t much you can do.

If it were a 2nd Gen then it may still work but it is no longer receiving updates, and should issues arise that device is considered obsolete so it is no longer supported for service by Apple. Providers have also started to drop support.

If it were a 3rd Gen then it will likely be fine, but it is no longer receiving updates as the model is discontinued.

Identify your Apple TV model - Apple Support

That would probably be an Apple TV (3rd generation), but do check. Does it say ‘A1469’ on the bottom/in the About screen?

Lots of people still use them. I’d like to think the newer models do offer more, though.

The 3rd Gen would still work exactly the same as when you purchased it and no one would be forcing you to purchase a new one. Older products will become discontinued, and that one is actually 7 years old at this point. Apple supports their products longer than most. The 6S is still receiving updates, as is the 5S. However, no product is going to guarantee you indefinite support.

The 4th Gen runs a completely different OS that the older hardware is simply not capable of running.

This is is a user forum, no one here works for Apple. Your post would have been removed by a moderator because it was in violation of the terms, terms you agreed to when you signed up. This is a technical support forum.