When I first started watching Teekyuu, I didn't expect to like it as much as I did. Really, the comedy is hit-or-miss and might not be for everyone, but if you're looking for a quick laugh and can't bother with 20 minute episodes, then Teekyuu might be for you. The characters are all ridiculously funny and lighthearted, the opening was extremely catchy, and you sometimes forget that this show is supposed to be about tennis.
I thought the seiyuu did a great job throughout, making the comedy stand out despite the absolutely random story. Overall, I enjoyed every moment of Teekyuu, and while it's not a masterpiece, it shows that caffeine and a sense of humor can go quite well with each other.