I can't believe all the Lesnar haters in here. Following is a little history lesson on other arguably "undeserved" title shots following the same logic as some of the posters here:
-Anderson Silva gets a title shot at UFC 64 after beating Chris Leben in his debut UFC fight. He was 2-1 in his previous three fights (the same as Lesnar is now).
-BJ Penn gets a welterweight title shot at UFC 46 despite having never fought a welterweight bout in the UFC, AND not having fought a bout in the UFC in nearly a year, AND with his previous bout being a draw, with his last win in the UFC over Matt Serra.
-Rampage Jackson gets a LHW title fight against Chuck Liddell at UFC 71 despite having only one UFC LHW bout, a win against non-contender Marvin Eastman.
-Big Nog, at UFC 81 (where Lesnar made his UFC debut), received a title shot after beating Heath Herring in Nog's UFC debut, the same man Lesnar beat prior to this upcoming title shot with Couture. At that point. Nogueira was 2-1 in his previous three fights, and had not held or fought for a title in over three years.
Randy Couture, at UFC 68, gets a title fight against Tim Sylvia for the HW title, despite being 2-3 in his previous five fights (all at LHW), AND having not fought a HW bout in FIVE YEARS, AND coming off of a loss to Chuck Liddell for the LHW title.
Looking at it from this perspective, it's hard to argue that Lesnar deserved this title shot less than several of the current or recent UFC champions.