Just found out about this roguelike:
Steam Marines
Basically, the premise is that you have a squad of 4 Steam Marines fighting for their lives on a steampunk spaceship. You can use squad tactics such as covering each other, destroying walls etc. etc. It's a completely graphical roguelike in development that has an alpha demo available for download.
My gripes with it so far (yes, I know it's an alpha...)
Movement is restricted to four directions. No diagonal movement allowed at this time. This means if you have one guy behind another and want to make a wall, you'll have to use 2 movement points out of the 4 per marine to do so. Meanwhile, the enemy is busy decimating your squad.
Tiny, cramped corridors which force you to use the wall destroying mechanic, which happens to have a failure rate!, instead of giving you more room to decide for yourself about positioning and anything else.
Balance problems that go beyond your average RL. Sure, it's a roguelike and all, but most of them have some sort of progression where you fight enemies that are somewhat dangerous but only f you don't use proper tactics. Dungeon Crawl Stone Soup demonstrates a proper, at least for me, progression mechanic: you start off fighting some goblins, hobgoblins, and bat on the first 2 levels or so and then progress to more dangerous enemies, barring any randomly generated elites :D. Steam Marines, however, has your squad going up against robots that can robots that deal anywhere from 25-40 damage in a single hit and they almost never miss AND your squad only has one member that can do equal amounts of damage but you have to use him carefully since he can accidentally kill your squaddies if they are in the way. The other three guys don't really make a dent. I haven't even been able to make it past the first level due to horribly imbalanced, in my opinion based on a few sessions with the game, enemy damage output.
Try if for yourselves here:
http://www.steammarines.com/