Well, that's exactly what Shadowgun is - a mindless TPS. And you know what? That is OK, my friends. Sometimes - actually, most of the time - it is better and easier to be honest about what you are instead of trying to be something you're not. Shadowgun is very, very honest about what it is, and I appreciate that, even if it's a genre that I'm not the biggest fan of.
When I was playing it, my cousin walked in and asked me if I was playing Gears of War. A lot had to do with the bulkiness of the character, the hiding behind barricades and the complete sci-fi shooter theme it had going on. Sure, usually a knock-off Gears of War would be a negative thing, but considering this is coming from the OUYA and is an indie developed game, it's quite impressive that a casual onlooker would make that comparison. And actually, a lot has to be said for the graphics. Sure, it isn't the most polished game, both in graphics and AI, but compared to a $60 triple-A title, it's really impressive.
It does play a lot like Gears of War, though. It has some different game play elements that set it apart from Gears, but overall, it's hard not to make a game like this and not elicit comparisons. Again, for it being an OUYA game, I remain impressed. It's one of the games you can show people who are on the fence about this new system and maybe sway them towards considering it more than they were.
Overall, I enjoyed this game and I am enjoying the OUYA as a whole. I have no buyers remorse yet, and that's saying something, right?