Brady needs a big Julio Jones, Megatron or AJ Green type of playmaker. All his receivers are from the inside. Stopping the Pats is easy once it's a good enough D, and that is clogging the middle to force lower percentage passes.
Lloyd is a nice third choice at best and is sure-handed, but he's far from a weapon. Welker had his run but is continuous errant drops hurt, and hurt a lot. I suspect he'll be gone after this year. Hernandez, while a nice weapon, is not a playmaker on his own. He needs Gronk to really be effective, because without him, he's basically a bigger, slower Welker. So the only real weapon, consistent weapon is Gronk, but he appears to be injury prone.
The running backs look solid and there's also depth there, but still tend to go invisible when the going gets tough. Like I said, if Brady had a legitimate outside threat that could get separation, that could catch back shoulder throws or high passes, this team would be more dynamic. It's the same thing down the stretch. Really hot and dangerous, points by the bunches. But a tough defense comes and they can't score more than 20 points.