Nothing is wrong with it. It is just another games store.

Just my personal opinion

The good clearly are the free games and that some games go cheaper there, they have better sales sometimes. The bad is that the store is badly optimized. The UI is annoying, no cloud saves for a lot of games. As of recently there were no achievements or even a cart, but they have that now which is good. The friends tab is bare bones still. They have aggressive DRM. For some reason it's a pain in the ass to log in, but that might be just on my end.

Now with GOG, you don't have DRM, you can integrate all launchers so you can launch all the games from one, which for me, is pretty useful. GOG has great deals. The bad is that the ui as well is kind of bare bones, but i don't know, they are not trying to take over the market and their store works very well.

As of steam i don't need to say anything, everything is in there. If you play on linux you basically will get every game from steam. They have the most robust launcher with the most options, etc.

That said, personally I use the three of them. Gog primarily since i can launch everything from there and if i find a game in there, i'd rather get it from them. But i've found sales on epic too good to let go so i play those games there. For me it depends on what they're offering, but for some reason i really dislike Epic's layout and ui, i feel like it is very annoying and that it is missing a lot.

what’s the issue with Epic

Enshittification.

why should I go for Steam

Not sure you should.

or GoG?

I hear GoG tends to be less DRM-y.

Epic Games is useful for the free games they giveaway every week, some weeks better than others. And I know the topic of ownership of these "free games" is another conversation, but I'll take advantage of it while it's there and also while giving them little to no money.

I refuse to patronize Epic until they continue working on UT4. I've been playing their games for 25 years and they make fortnite then decide to just drop all of their long term fans.

Epic’s customer service sucks. Consider my last experience from a prior xmas sale:

• had multiple games in the cart with discounts applied, checked out with paypal, but for whatever reason the communication broke and didn’t go through
• my cart then got stuck in a limbo where I couldn’t check out with any method to receive the discounts, everything was full price again
• opened a customer support ticket to get the problem resolved, then went through 3 days of back and forth, explaining the situation over and over because
  • each of your replies are handled by whoever the next agent is
  • who apparently don’t read any history of the ticket, so they provide feedback or advice that already didn’t work
  • and it can take a full 24 hours or more to get a reply that ignores all previous replies
• by the time the error was resolved by a competent person, the sale was over by only a few hours
• despite the fact that I only missed the sale window because their reps were incompetent, they refused to make any exceptions to apply the sale prices I had been trying to checkout for 3 days

So, fuck them. I only claim free games from them now.

And I concur with problems other people have mentioned.