Not a horrible game, but not one I'd jump to play again anytime soon, since the game has quite a few glaring flaws, such as: the music being incredibly forgettable - shocking for RE, extremely jarring and poor voice acting for the most part (they butchered my girl Rebecca), unbalanced enemy attack damage and health, and being weak and extremely short retellings of RE0, RE[make] and RE3 to work for 2-player, two of which being beloved entries into the franchise and RE0 being the newest "fixed camera" styled entry. Some mechanics, like the herbs are used weirdly, only healing you up when on screen instead of being stashed like any other RE game and ammo drops being for a specific gun rather than the one you equipped, negating the purpose of the weapon select screen.
What the game does well on however is its new stories like the Fall of Umbrella and the various "backstory" levels and missions, obviously being the main selling point of this game, giving extra content for the games mentioned before (and RE2) which is worth it in my opinion. The backstory missions aren't multiplayer on a first playthrough, so this game isn't too friendly to 2-players, despite making accomodations in the stories to fit them.
Overall, I'd recommend and rather play Darkside Chronicles over Umbrella, since that has better voice acting, story retellings and less infuriating and problematic areas.