There were many years there where AMD really shined on the CPU front, in recent years things have changed quite a bit. While AMD still makes very useful CPUs in their price segment (not counting bulldozer, which is very overpriced currently), AMD is basically selling more cores, and less per core performance, at a reduced cost. In the world of heavy duty productivity apps like engineering apps or video editing, or operating a very heavily loaded server, all those cores can come into play and perform as good or better than intel systems for the same dollar. When it comes to gaming, the VAST majority of games still only utlize 1-3 cores, and the performance of those games, is directly associated with the number of instruction per cycle on 1-3 cores combined with the clock speed of the CPU. As it stands currently, Intel Sandy Bridge CPUs are delivering roughly 40% better per-cycle-per-core performance than AMD phenom II or Bulldozer. What this translates to is better gaming performance with an Intel CPU in the vast majority of cases. As it turns out, the vast majority of games will perform better with a dual core intel i3-2100, than any AMD CPU available at any price. Move up to an i5-2500, and there isn't an AMD CPU that can compete in any gaming contest. In fact, even of you allow overclocking on the AMD CPU, there is no realistic stable overclock that will compete with the stock speed of an i5-2500.
The 8150 is currently priced higher than a 2500K, yet, the 2500K has substantially better per core performance, which translates to better gaming performance. Even in heavily threaded comparisons where all 8 cores are used (no games use 8 cores), the 8150 finds itself between the i5-2500 and i7-2600 quad cores. Even worse, bulldozer will use substantially more power doing it, which translates to more heat, more waste, etc.
If you have a budget range that can afford an 8150 and nice build around it, then you will do yourself a favor by using that budget to get a 2500K and a step better GPU than would be afforded on the AMD config.