"Burn Notice" is a very fun show, and it isn't incredibly corny or anything. Pretty explosions, complex characters that can't be figured out entirely within 5 minutes and yet never do anything that doesn't seem like them, and some innovative ways to get the job done. The character interactions are nicely designed, too...
Speaking of character interactions... "Merlin" utterly fails in that department. Yes, they get the costumes to look pretty and they picked a cast that isn't too hard on the eyes, (and the CGI isn't too shabby either), but I hate all of the characters. They usually have exactly one trait that defines them, and seem to get a lot of lines just sort of handed to them without any thoughts to "character development"... not to mention how the timeline is screwy beyond words. Fun to watch the fighty bits, but turn the volume off when people are talking.
"In Plain Sight" is also quite enjoyable, the plots aren't that ridiculous and the characters seem like people that you might run into in your workplace. Not perfect, but not so "flawed" they resemble 90s-anti-heroes.