Battleborn is a fantastic game, I love basically everything about the game. The design, the lore, the maps, the missions, the jokes... there's a lot to love.
It does draw inspiration from MOBAs, but items and perks are reduced to an easy to understand form. You still maintain adaptability and choice through the truly unique Helix perk system (that iirc, Overwatch once had plans of copying). The Helix system allows you to choose 1 of 2-3 perks at a time after leveling up (you can unlock the choice of a 3rd perk by completing challenges), so you can dynamically adapt to the mission or match! You aren't overwhelmed by choices mid-match. In addition, the Helix system offers new ways to play your character, and there are lots of combinations that you do not have to meticulously plan ahead of time, so you can enjoy many builds if you wish.
Gear (like items in MOBAs) is also interesting, you pre-select it so you don't have to fumble around mid-game and have your action screech to a grinding halt. It can give you an edge for your build, or just give minor improvements to your character. It's also not overwhelming, you can choose 3 gear for a loadout and they are relatively easy to understand.
The story missions are fantastic and are very replayable because of lots of unique character interactions and multiple sets of voice lines for each mission. No two missions are exactly the same (no procedural generation either!), even if you choose a character you've chosen before.
The PvP mode is also fantastic and unique compared to other games. The game modes are abridged versions of MOBA game types, but more refined- smaller maps and fewer lanes, but lots of angles and maneuverability options, especially for certain characters.
Overall, it was a very well thought-out game and I really wish for it to be revived and preserved- and now that Overwatch won't overshadow it and PvP games seem to be struggling a bit, it is a fantastic time for Battleborn to make a return.