How long/big is the game and what is the replayability like please?
Well Digi, the single player is pretty big. it will take week(s) to finish it without founder since you have to wait for keys and your energy to replenish. with founder bought, it still takes quite a few days of playing since there are a lot of missions and a lot of fights. A good amount of missions require you to battle like 10 to 15 guys to advance to the next mission. there are even gauntlet type missions where you have to fight 50 and 200 guys so it takes some time. Some would say that`s a bit boring but the gameplay is so addictive that I personally would have liked even more fights.
you can come up with strategies regarding the skills (mixing and comboing them), farm gold for that specific outfit you want etc. and after you finish every single mission in single player, there`s the climbing the pvp ranks in "multiplayer" where you don`t fights in real time against other players like in Epic Duel, but their chars are decked out and can hit you like a train if you aren`t playing strategically. If you plan on climbing the pvp ranked ladder and unlocking the pvp items it will take you a very very long time.