Matching to certain heroes more than others is another not so random thing. I can also have the same initial card options for more than one game. If it were random the chances of that happening would be virtually impossible.
Something I always try to thing of in times like this is the following "You only remember when bad luck screws you over-you rarely remember when good luck triumphs". The human brain has such stuck in its inner workings it would seem. Sure, sometimes I'll get angry when my opponent just so happens to block 2 times on 6 attacks(least amount possible to proc block twice), and get the exact two supers it would appear they need. But at the end of the day, the same thing will occasionally happen to me, I just don't remember it as well, as that is how our brains are made to work. The game truly is random, or at least as random as the random operator in the lines of code is(although the algorithm for that is pretty basic, 15-25 lines depending on the language), and for a company such as EA, even in one of their more neglected games, their RNG is just fine. Keep track for another 500 games, tracking either block meter, bounces, supers of you/your opponent, or all at once! I'd be interested to see what the community finds if we were all to do this, but I can guarantee you it is all random, no matter how frustrating the game sometimes is.
