I really do not understand why people are complaining about this? They added the Prothean for the hardcore fans that were going to buy the Collector's Edition and it was going to be a CE only character originally. The company decided to release the entire Prothean mission along with weapons and armor for $10. I mean this is already more then what you got with the LoTSB. You got a mission with Liara in that and some more resources and the ability to respec your squadmates. One could say that was held out of ME2 until it was released. LoTSB is the best DLC I have ever bought.
As someone who purchased the Collectors Edition in Full, I would want my money back if they released this for free when they stated it that I was getting it for free in the CE. This is not the same thing as Zaeed and the other free DLC the company has given away for free with ME2, this was suppose to be a CE perk, not a standard edition perk. I say Kudos to Bioware for deciding to make this more available. They have done a lot that I am not happy about with ME3 such as not keeping on voice actors, adding co-op that has the ability to affect the single player, adding other modes then just the standard RPG, also the killing of the lore with heat sinks and not having to worry about ammo. That is all worthy of complaining but this, this is just really stupid to be complaining about, you are getting a CE perk, be happy you have the option to actually get it, some game companies never make the CE perks available to the standard editions. Bioware did, and no I am not a blind Bioware fanboy, I hated both Dragon Age games, Loved Jade Empire, Neverwinter Nights, I liked the first Old republic and I disliked the second. I do not play MMO's so I will not even touch on that.
Most of the people, (not all who are complaining), either were not able to or did not reserve the CE, It is part of being responsible as a person and a consumer, I knew there were going to be benefits to the Collectors Edition over the standard edition. So as a responsible consumer I took the initiative and not only did I reserve the Collectors Edition, I paid it off in full months in advance so I could guarantee my copy with the additional content. You are not entitled to the Prothean and the additional content, you have to pay for it if you want it just like I did on my CE copy.