Deadpool is a jerk in the comics. His mouth is considered his most dangerous weapon, as he taunts and insults and talks nonstop. It annoyws and irrataes ihis opponets to the point where they make a mistake, and he can get to them. during Civil war, cable sides with Captan america's Secrit avengers, and deadpool sides with the government. Deadpool goes after Daredevil, and ends up taking on all the secrit avengers. at one point he slaps a "device" onto daredevil, and tells his it's an interdimensional teleporter, and in 5 seconds it will teleport his ( daredevil's) brain to dimension X. Daredevil peels the device off, and looks at it, and says " this is just An iPod with some double sided tape on it" Deadpool suckerpunches him, and takes daredevil down, and replies "I know, but it distracted you" Moments later the rest of the avengers show up, and take Deadpool down. When cap askes Cable how to restrain deadpool, he responds " Duct tape. Lots and Lots of Duct tape. At least one roll for his mouth alone. "
On the subject of his skill, There is a point in the gambit limited series where a 1 million dollar bounty is taken out against Gambit. Gambit spends the entire issue outwitting and outrunning mercenairys. he finaly gets stopped by the constrictor.. and then deadpool comes in, and knocks the constrictor out. He's about to put gambit down, and gambit askes him " so how much are they paying you?" Deadpool tells him the price "1 million"
And gambit ofers him 3 million NOT to kill Gambit. Deadpool agrees, and gambit leaves. there is a woman running with him (i forget who it was, might have been currier) and she askes gambit why pay Deadpool, since he's eaisly outsmarting and out manovering all the other mercenairies? he replies " simple, Becuase I CAN't Beat Deadpool, not while running from everyone else. I can run from deadpool Alone, or I can run from the chumps. Not both at the same time. He's THAT good."
For the record, Gambit is Head of the unified Guild of Theves and assassins at this point, the 3 million dollar check he writes deadpool is legetimate.
You want to see definiteve, Comic book accurate deadpool? go watch the animated "hulk Vs. Wolverine" movie. It's Deadpool EXACTLY how he is in the comics. Yes, he's an incredable assassin, but he's also a complete goofball.