It's pretty one sided, I mean, I've not seen anyone try to pull that kind of stuff saying "BB will eat OW's lunch" it's always fans of OW trying to sleight BB which doesn't make any sense as they're both awesome games.
If they both succeed, everybody has 2 cool options to play, if one fails then everybody has less options and nobody truly wins.
I'm also a bit frustrated that the Beta gave so many people a bad first impression, but I really think thats just due to the nature of a Beta.
I think I summarized it well in that thread with this comment:
http://www.neogaf.com/forum/showpost.php?p=204347629&postcount=120
"I assure you that the conditions surrounding the beta prevented you from expriencing the game the way it can be experienced today.
Nobody knew what they were doing back in Beta and in such an objective focused game that absolutely necessitates working together and strategizing with a team, it's just not going to be fun with everyone runnning in guns blazing having no idea how anything works."
Even today with all of us having a moderate grasp on the game and its meta qualities, we still get frustrated when were paired with an inexperienced team because that directly affects how well we can do and how well our team can work together.
Imagine back in beta when nobody knew what was going on and everygame was full of players trying to rush in and play it like COD straight up ignoring minions and teamwork.
I can definitely see how that could paint a negative picture of the moment to moment gameplay, but there is such a massive disparity between the amount of fun I have in those matches compared to the matches when I have a cool team that communicates and works in unison.
It's a difference of night and day and if someone could only experience a bad team, I can see how it could make them hate the whole game.