I'm no expert on drama, but I thouht the opening Shadow Line was bad -- even down to basic dramatic and production points. Some bits -- for example, the press conference scene, made me squirm with embarrasment for all involved. It's also hammy in its own way. After the excessive hype, I couldn't quite believe it. I haven't watched it since, so I have no idea if it has improved.
For drama, complexity and pathos, as well as comedy, you can't really beat this new breed of post-The Hills reality soaps, notably the two English examples, The Only Way Is Essex and Made In Chelsea, though I am also partial to The City. This is great telly.