The open beta is now more or less over.
PvP was more interesting and matches were usually longer, beside the usual matches where you steamroll a enemy or you get steamrolled by them. So far it is a pretty good game and more or less a more "modern" Team Fortress 2. The game has a lot of similarities to it and it is not just the visual style.There are also similarities in the game modes, the archetypes of heroes/classes and gameplay mechanics. That is not a bad thing in my book.
I think Blizzard was never really good in creating something "very original", maybe with the exeption of Diablo 1. What blizzard is really good at is taking already known concepts and making them "better" and more accessible.I played the game till level 11 alone, with bunny and with some german guys with a full team. It was pretty fun and its definitely even more fun when you play with some friends together.
The open beta was pretty balanced with two or maybe three exeptions. The turret mode from bastion and the turret from that dwarf guy feel like they are too strong combined with the low effort and skill players need to use them. Also the sniper riflr of widowmaker appears to be a bit too strong. Most heroes have 200hp and the sniper rifle will make 150 damage on a body shot. Headshots make 2x damage and considering that it is likely you will shoot players that are not on full health, it is very easy to one shot a lot of players with it.
There is already a pretty interesting sheet people are pulling together, revealing pretty much all the data behind game mechanics and characters.
The Oversheet