Batman beat Guy Gardner with one punch, so saying that as an achievement for Doomsday doesn't make him out to be the nigh unstoppable bad ass that he is. For all the kids that aren't old enough to have read it years ago, Doomsday beat the entire Justice League of America with one arm tied behind his back. Then went on to beat Superman to death with his bare hands in a knock down drag out fight. It ended with them both delivering kill blows to each other. The resulting shockwave from the impact shattered glass for miles surrounding the impact Crater.
This is how tough Doomsday is:
http://www.youtube.com/watch?v=Noedf3JhFYABut the Main Man is tougher:
http://www.youtube.com/watch?v=IbT0BIJhXS0Bare in mind that the Lobo clip is from a cartoon that was PG rated at the most. Lobo's a genius when it comes to combat tactics. He's a dirty fighter, and he doesn't get distracted from the fight. While they both love random destruction Lobo won't get distracted in a fight by something new to break, but he will get distracted by hot broads. But who can blame him? As shown in the Doomsday clip everytime he downed Superman instead of finishing him off he went after a new target. Either assuming Superman was down or just killhappy it doesn't matter. Lobo is tougher then Superman and he's not going to let an advantage pass. Especially one everytime he's knocked down or away.
tl;dr Another victory for the Main Man and another two bit bastich gets fragged.