Former 49ers S Taylor Mays will try to rekindle his career with Cincinnati, which traded for him with an eye on bolstering its safety depth. A personnel man familiar with Mays told PFW that Mays' size and "great range" were assets but that he lacked instincts when it came to taking proper angles. Source: Pro Football Weekly
His complete inability in the passing game makes him a 1 dimensional player...and in the NFL it's hard to hide 1 dimensional players because the opposition picks on them. And it's hard to be a good linebacker if you have no instincts when it comes 'to taking proper angles'.
I agree with Dfence but I always thought he lacked a lot more than just instincts. I thought given his raw talent in the right situation he could be a playmaker. That situation did not include Cincy though.