As an artist myself, I wanted to comment the artistic part : no, it’s not like Borderlands. It’s just plain different. If anything, it’s more like Wildstar. It looks so much like Wildstar that for the longest time, I was sure the game was a Carbine Studio game. @Gearbox, come one, you did work with some laid out Carbine Studio artists, didn’t you? 
It would be like saying that World of Warcraft also looks like Borderlands. Different approaches to the so-[wrongly]called “toon” rendering.
Honestly, Overwatch and Battleborn kinda look alike though. Battleborn got way more FX thrown our way, and is overall a lot more coloured. OW chose to stay a little more “subtle”, improving the overall understanding of what is going on. This is my biggest issue with Battleborn, to be honest : it’s often a big mess and could really use a toning down of all visual effects or maybe just a slider somewhere.
Appart from that, Ray is quite right in his approach. The game are, at core gameplay, extremely similar and it’s almost impossible to avoid the comparison. Hell, the reason why there even were comparisons in the first place is precisely because they do look and feel the same. Character-based shooters with two specific abilities, specific non-replacable weapon, cooldowns, an ultimate, unique designs, shooting bullets, “magic”, rockets, and blades at each other.
It requires a second look to grasp that the objectives are different and will require a different approach of the game in order to win. OW is a very static game where you literally only have to stay on a specific point throughout a whole match to win, whereas Battleborn will always require you to move or push a lane and take a lot of factors into account like shards, minions, gear, helix, etc. But all of this is already the second look.
As Ray said, you could very well swap heroes around and not be able to tell the difference after a few adjustements to numbers. Benedict and Pharah are the clearest comparison, despite the fact that Pharah is one of the biggest clue that OW is not very well thought out and overall badly balanced. Ironically, the “less fleshed out/polished” Battleborn got their Benedict way, way right-er. But how wrong would a Reaper feel in Battleborn ? Or a D-va ? They’d just fit right in. It’s just that IMHO, Battleborn did a better overall job at balancing their characters while introducing more subtle, but clear, variety. they also did a better job at character design. And at game design.
At everything, actually, except, maybe, the too-much FX part, and a lack of advertising… But who can fight the Blizz-acti all-powerful syndicate ?
