Okay, first off, Tiger and Bunny is a super hero show. It starts off with the idea of super heroes for commercial enterprise and runs with it throughout. Even if that's not your thing though, I'd still recommend Tiger & Bunny. The commercialism is ever present, but only sometimes in the foreground. It often steps aside to let other aspects take the spotlight.
Also, the show gets better as it goes along. The plot is relatively simple, but engaging. The show's structure is reminiscent of Witch Hunter Robin's. On small scale, each episode is just the incident of the week, but as it progresses, the show slowly builds up to a truly grand finale.
Tiger & Bunny is also good, old-fashioned fun. It's relatively upbeat. The characters are likeable, and have a certain genuineness to them that is lacking in most shows. In particular, Kotetsu, who is a single parent, brings much to this show that feels new and different after all the shows with angsty high school protagonists. He is self-sacrificing, but without the usual saviour complex that has grown so tired since Trigun. His faults are an important part of his character, and they often define his friendships with other characters.