[2021 Update at the end]
If you don't have Netflix and don't plan on getting it, there aren't many reasons to continue reading.
So, are you interested in Netflix? Alright. There are cheaper ways to watch Netflix on your dumbTV, are you still interested in Apple TV?
Okay then. Are you also interested in gaming on your TV? Trust me, there are better gaming systems for your TV, and if you don't want to go for expensive solutions like PlayStation, I would recommend a retro console like NES Classic, for example. Seriously, you'll have a better gaming experience than with Apple TV. The selection of games in the Apple TV App store is relatively small, and the gaming experience with the Apple remote is simply disappointing. So, you'll need a "Made for iPhone, iPad, Apple TV" game controller. So, add another 60-90 euros to your budget. So, we've reached PlayStation. Even if it's a used one.
Are you still interested in Apple TV? Okay, okay, it also offers access to your photos, music, and theoretically your podcasts (they don't work for me). It also has a good YouTube app, so if you're obsessed with YouTube and want it on your TV, then it counts.
If you're not interested in the above, then why are you still reading? One last thing, it does screen mirroring from your iPhone/iPad/Mac, which might come in handy at some point. However, I tried to "steal" and mirror games from my iPhone to the TV, but there was significant lag.
So, to sum up, in Greece, we only have Netflix for streaming services, as a gaming system, it's not good, and the rest it offers is done well, if you're interested, of course. And one last important thing: I am very disappointed with the Apple remote and the overall user experience in navigating through menus, by far the worst user experience on an Apple device. It's been a month and I still haven't gotten used to it. Oh! And Siri doesn't work in Greece. Only for dictation. And also, we don't even have the Apple TV app in Greece, which gathers all the streaming subscription services into one unified app. Makes sense, since we only have Netflix, what else would it gather?
So, where do we end up? Apple TV is not bad, it just tries to do too many things at once, and some it does well (Netflix, YouTube, Screen Mirroring), some it does poorly (User experience, Gaming), and the rest is probably irrelevant. In other words, it's a good product, but not "Apple" good, and in Greece, where we don't have enough services, it's probably not worth the money.
[2021 Update]
I thought I'd update the review since things have slightly changed for the better. Now on Apple TV, you also have the option of Apple TV+ for streaming.
The availability of games continues to be disappointing on Apple TV (compared to, let's say, the iPad), and I would say I don't see any progress in this area. BUT: Now there is the option of the Apple Arcade subscription service, where you have a choice of over 100 games, which I would mostly characterize as "casual." Don't expect to see any blockbuster titles like The Witcher, you know... But anyway, there are some good options to kill time.
Perhaps the biggest positive update is that now PS4 and Xbox controllers are 100% compatible with Apple TV, which are much cheaper than MFi controllers. And they work (almost) flawlessly (vibration support is not available yet).
After 2-3 years of use, what hasn't changed at all for me is the frustration regarding the Apple Remote. I consider it the worst product Apple has ever released, and not only that. We all hate it in the family, I just want to see it burn.
For this reason, as well as the inflated price (considering all the above), I will give it a rating of 3 stars