Well, I deleted the picking on pieces (marking is impossible to rationalize? really?),
Really. REALLY really.
Mostly due to the "One mark automatically supersedes another". Again, there's an obvious game balance reason, but there's no internally consistent, universal, model I have found which explains various possible combinations of mark and re-mark.
That all the "simulationist" putting together modifier after modifier and constant fiddling with minutae slows things down incredibly and exposes the inner workings of the game, putting a severe strain on suspension of disbelief. As a DM, my job is partially to narrate the mechanics, to turn the die rolls and hit points into flavorful descriptive text that makes the world come alive, and previous editions fought back, constantly interrupting the narrative with meaningless trivia and rules-lawyering. 4e works for me, rather than against me.
While playing "reverse the quote" is cute, it doesn't answer the question. Explain "Come and get it!" to me.
Here's the situation: There's a Goblin Archer secure behind cover. Twenty feet away, a fighter makes a rude gesture at him. The Archer has a powerful ranged attack and a secure position; he can hurt the fighter very easily without exposing himself. Instead, he *automatically* leaves cover and runs to the fighter, even if he has no melee attack capability.
If you reply "Well, goblins are dumb...", make it an Int 30 Mind Flayer.
(And if you don't think a power which basically forces an Artillery type monster to engage in melee won't be used for precisely that, you haven't played much D&D...)