I don't like it, for several reasons.
The most basic surface of it is that I think the store just really sucks, doesn't have as many features as steam, and it's once again another useless launcher to go through, meaning you don't have your usual account with your achievements, friends, other games etc.
I did use some others launchers in the past and I still do for some exceptions, but I like to avoid it when I can, because Steam gives me the most covenient user experience. I actually even used the Epic Laucher (before the epic game store) to play Paragon and use Unreal Engine, so it's really not just "it's another launcher" issue for me, it goes deeper. There are a lot of other reasons to be against the epic game store, which are more of principle / moral reasons.
Epic has been using awful methods to get more attention. They don't even want to have as many features as steam, because they based their userbase on mostly younger players who discovered pc gaming with fortnite and such, and don't really know better(which isn't their fault). They don't care about allowing forums, user reviews and others because for them "influencers" like youtuber and streamer is the new norm and people only care about that to decide if they want a game or not, so review / discussion is, for them, useless now.
A large part of Epic is also owned by Tencent, and I don't think I need to explain why this is bad.
Epic has been going into a very aggressive exclusivity method to force people to play on their launcher. They know their plateform is bad, so they just use the Tencent money to buy exclusivity deals on games and force people to play on their launcher if they want to play a game.
It's also funny how Epic constantly moans about Steam 'monopoly' but are slowly buying exclusivity and developers to create a monopoly of their own.
This is not healthy competition against steam, or others (like GOG). Real competition should give you a choice.
You want to offer a new store alternative? Then make it good and give people a reason to go there, by making a quality service, not by making exlusivity deals to force people to go there only because they don't have a choice. This is really only bad for the PC market, as they try to fragment it and make it more and more like consoles.
I also constantly see people praising epic for the famous "12% VS 30%" revenue sharing thing, but a lot of people ignore a lot of revelant informations, like the cut with epic that goes directly to youtubers and streamers with their "epic game creator code", I think I remember reading that up to 20% of the sales were shared with "content creators", because that's how Epic decided to promote their games.
I just see the Epic / the Epic Game Store as a huge sketchy, dishonest and unfair platform. Luring people with the infinite china money for free games in the hope that they just get used to their launcher really sucks imo, it doesn't improve PC gaming.
It's too bad because Unreal Engine is amazing though, they are doing great work with this, but it's a shame that it's attached to such a tainted company now.