Don't worry, the program is fine as is, I was mentioning I don't think you end up in disproportion. HDS clearly doesn't know much, or at least he hasn't proven yet that he does. You will get many people along the way telling you, you are doing things wrong, but what most don't realize, there is actually a different way of doing things depending on your experience and level you are on. There isn't much better than SL5x5 for a beginner, in fact it is close to the best. Once you go to the next level then yeah sure things change a bit, but not right now.
Tough crowd. As I said - his leg strength is out of proportion, you see that with a lot of novice lifters. Both deadlifts and squats have muscles in common that do the lift, since it's a compound exercise. Lower back, knees, core, hips . Your hamstrings are smaller muscles than quads, the reason deadlifts are so easy is of the shorter, natural movement ( our body was made to pick stuff up much better than lift it up) . Gradually you will squat more than you deadlift.
Many people don't train their quads hard enough, hence the strength difference between deadlifts and squats. Once you get your quads to grow properly, your deadlift will be lower/same as your squat.
Also , I can't recall saying that he's doing his exercises wrong , don't put words in my mouth. What I will say is , focus more on your quads. My routine is quads every week, hams every 2-3 weeks. A lot of the quad exercises like squats and leg presses also work your hams secondary.
Lastly, don't be so hasty to make assumptions. I've trained for 6 years, 4 in Virgin here and 2 in Metroflex in CA while living there. Met a lot of big guys , made friends, got a lot of advice. To say that I don't know much is just plain stupid, none of us do. Even when you know a lot about bodybuilding , you still know nothing.
PS : @ remus, I forgot to ask how tall you were.