As of now the game looks really promising. But Im afraid that the matches are over to fast, shortening the long time motivation.
My wish: tie multiple matches together (e.g. 5) where the outcome affects the next one (unlocked feats at the start, increased spawn count, better loot etc.).
Extra props for changing maps according to outcome of previous battle (or adding some kind of tactical flavor), being able to swap loot with allies between matches or an enemy treasury for pillaging at the end.