GPU artifacting is a big issue. When it happens once or twice, you can ignore it. But don’t be the type of gamer who ignores it all the time.
The modern gaming hardware market looking like it’s all about 4K gaming at 60+ FPS. Nvidia has already released its 30-series of GPUs that gives a truly massive performance, but chances are, AMD is going to trump or at least compete really well with its “Big Navi” – prices for which are currently unavailable.