I'm a casual fighting game player. I can't even beat the battle mode on very hard, with any of the 3 characters, and I've played for many hours already. Maybe that qualifies me as below casual even lol. But either way, I can say I find this game very fun. It's accessible, trust me. I don't have much of a desire to beat it on very hard. At least not yet. Unless there's a nifty unlock in the full game, which will be troublesome.... but either way, it's only been a day. Even noobs can learn/train.
It made me want the game even more, though. Just my two cents, from a humble non-hardcore guy.