Every single time we see Guy in battle, he's epic. The first time, in Part I against Kisame and Itachi, he first takes down Kisame (tho that was due to the element of surprise), then forces Itachi to retreat due to his ability to duel with a Sharingan user. The second time, he and Kakashi are fighting back-to-back (they're best friends, amirite?) during the invasion. Third comes his second battle with Kisame before meeting up with Kakashi - he goes to Sixth Stage Hidden Lotus without any real effort, kills the fake Kisame, and then is back to normal without any apparent effect, while Lee took months to recover (excl. Gaara's Sand Coffin). Plus, Itachi respects him as a warrior and tells the rest of Akatsuki never to underestimate Guy - that has to count for something.

I had no idea Orochimaru's true form would be that!