Deadpool, when he gets serious, is pretty focussed as well.
Deadpool #250 was a fine example of this. He kills off an entire army (the whole ULTIMATUM organisation) with a fair amount of prep:
Synopsis I found online: [SPOILER - highlight to read]:
Wade gets in contact with Preston to learn everyone was ok. Then he takes his time forming a plan. He first kidnaps a hacker, then steals some weapons from Stark and AIM, and then buys a farm out in the middle of Kansas. He gets the coordinates to Flag Smasher via some carved up ULTIMATUM soldiers, then lets the hacker go as several drones are seen being hijacked from an airbase. The whole ULTIMATUM group shows up on the farm, and Deadpool begins bombing them with the UAVs. He also sets off an EMP that takes down their aircraft. He goes around gruesomely murdering every single soldier and blowing a hole in Flag Smasher's head.