I loved COD4 and MW2, but my latest buy was MOH Tier 1. I thought it was a great game, not so arcade like with the COD series. In MOH targets just don't stand out like in MW2, its seems more real life.
Yes the last Call of duty was prity good , but found the Ai a bit weak and even on the hardest setting. I have seen adverts for MOH Tier 1 and have thought about buying it .