Alright, first post, but here's a few rebuttals.
On Kimi being stronger than Kabuto:
A) The manga compared Kimimaro to *SASUKE* in seal strength only. It's obvious however that Kimimaro is a frightening character, if he's already half dead and killing hundreds of Kyuubi Naruto clones.
B) Kimi was not compared to Kabuto. What was mentioned was that Kimimaro was Orochimaru's first choice, and that Sasuke was his fallback. This does lead you to wonder if Kimimaro has something more up his sleeve, since obviously the Sharingan would be much more helpful in Orochimaru's goal of learning all the Jutsu in the world.
On 'stronger than Kabuto' equalling 'stronger than Kakashi'.
A) Kabuto is not as strong a character as Kakashi. Orochimaru stated that he was only 'about' Kakashi level. It's important to note that Orochimaru is not omniscient, and that, like EVERYONE ELSE IN THE MANGA, he underestimates Kakashi. When Kakashi started the Chidori, Orochimaru was surprised. He was also surprised that Kakashi could perform seals, so Orochimaru is hardly the authoritative expert on Kakashi's strength level.
B) Kakashi obviously learned how to open the gates from his observation of the Rock Lee fight. (Unless you can possibly conceive of a reason why he would reveal his sharingan when he realized that Rock Lee could open 5 gates, and an equally believable explanation for Kakashi's opening a gate while rock climbing.)
C) Kabuto being compared to Kakashi is a COMPLIMENT. More than likely, from what we have seen, it is not that Kabuto could necessarily fight evenly with Kakashi, but rather that Kabuto likely possesses the same 'Jounin factor' that Kakashi, Gai, and a few other spiffy people in the series have. (Also known as the 'I'm cooler than you are. Period.' factor) If forced to hazard a guess, I would say that Kabuto's strength lies in a huge amount of flexibility in terms of what he can do, sort of like a really awesome generalist. At least, that's what we've seen evidence of so far.
On Naruto vs. Sasuke (or Kimimaro for that matter):
Naruto and Sasuke (or Kimimaro) is a bad match up. One will always be FAR stronger than the other, because of the COMPLETELY methods in fighting. There will never be an even fight. Even when Naruto and Sasuke fought on the rooftop in Konoha, when they were debatably the closest to each other overall, Naruto would've been the obvious victor with the Rasengan. However, considering that Sasuke didn't use the curse seal at all in that little testosterone induced battle, and that level 2 is just THAT FAR beyond level 1, it is likely that Sasuke (who is incidentally VERY UGLY IN CURSE SEAL 2... that might not go over well with the fan girls..) will soundly defeat Naruto and take himself to train under Orochimaru. After all, it has been established both that a) Sasuke is a prick, and b) Sasuke, Sakura, and Naruto have REMARKABLE parrallels with Orochimaru, Tsunade, and Jiraiya. Therefore, it is likely that Sasuke will train under Orochimaru, if for no under reason than to be able to summon snakes. Kimimaro has a similar bad match up against Naruto. Naruto is about Creativity, Sasuke and Kimi are mainly about skill. Lots of it.
On Rock Lee in general:
A) It is more than likely that this drunken boxing style, however intimidating Gai makes it sound, will merely force Kimimaro into the first curse seal state, if the previous patterns are any indication.
B) According to the Naruto PS2 game (which accurately predicted Shikamaru's new technique, and Neji's Ougi [that hasn't been shown, but was mentioned once.]) Rock Lee *APPARENTLY* will be able to use the gates with greater flexibility than he did against Gaara. Whether this is due to the effects of alcohol or not is unclear, but the ps2 game predicts Rock Lee creating a new move (The Shin Ura Renge, or for you english speakers, the Improved Extreme Lotus) that is the equivalent of 40 of his ultimate move (Again, the extreme lotus) in the span of approximately one second. Obviously, if this comes to pass, Kimimaro is screwed beyond words. However, it's important to note that the Naruto PS2 game has also predicted Naruto accidentally summoning THE FOURTH HOKAGE, so the trustworthiness of that game is a bit on the iffy side.
Summary:
Rock Lee is one of the most popular characters among an UNBELIEVABLY huge percentage of Kishimoto's target audience, and with good reason. He is both the comic relief AND the can of whupass rolled into one. It is more than likely that Rock Lee will defeat Kimimaro by my way of thinking, but if there is anything Kishimoto is good at, it's surprising the readers. Even if I *did* see Rock Lee's entrance coming. Obviously, the drunken fist style in this chapter was an example of such unexpected things (although it's very fitting for the character). At least with Rock Lee in the picture, things will cease to be overly dark and serious and grim as they have been the past volume or so. With Neji, Chouji, and Kiba all half dead, and Orochimaru inhabiting what could debatably be the body of Tsunade's younger brother, it looks like this arc is going to be keeping us on the edge of our seats for some time.