AbdulAlhazred
Legend
They SURELY attacked you, because they targetted you with an attack power.
They SURELY did not hit you, because they never succeeded in an attack roll against you.
The only reason this can be confusing is when one is confusing possible english definitions of words with the definitions of those words as game terms. Sometimes, a game term in a game does not have the literal definition of the word in the english language. If you destroy a card in Magic the Gathering, you do not take the physical card out to the backyard and set it on fire. If you gain a level in D&D, you do not add another storey onto your house. If you move the king in chess, you do not employ diplomatic protocols required when transporting a head of state.
Simply put, the reason this confuses you is you are not using the same language the game is. These cases are non-ambiguous within the game's language. Which you should use. Cause they're written in the game's language.
Sorry, but you're simply incorrect in this case. If you are really determined to argue about it I'd suggest going to the WotC Q&A forum and digging up the monster thread on the subject there. One of the core devs (I forget which one) stepped in and put this ugly bugger to rest. It hasn't (yet) made an FAQ appearance but the DESIGNERS OF THE GAME state flat out unequivocally that Magic Missile hits. The explanation was A) it has a specific target (or maybe targets depending on which Essentials book you read), and B) it does damage. It is an attack, it hits, it doesn't have a damage ROLL and therefor a lot of extra damage can't be applied, but riders that trigger on a hit DO work.
There's nothing I'm misunderstanding or unclear about here. I know the rules inside and out, trust me. I agree that your interpretation is not a BAD one and holds with the way things were generally interpreted when the game came out, but there were no auto-hit powers back then. Now there are. Times change. The new way of defining it works just as well and is perfectly clear. Notice too that "hit" was never really defined in the published rules, it was defined by working out the implications of different possible definitions.