The best thing that I love about TBBT so far (apart from every scene with Sheldon in it) is how it dealt with Leonard and Penny's relationship. That is, crisp and clear, and not overstressing it to the point of obnoxiousness. Of course I would have loved to see a comedy about four physicists and no long-term romance at all, but I guess that's too much to ask for. Looking forward to the rest seasons and hoping that TBBT keeps it this way instead of falling into the Ross-Rachel cliche:)