I didn't buy From Ashes when the game first came out, but somewhere in the months since, I did. I've been replaying ME3 to see the Javik stuff as well as the new endings, and I'd heard that taking Javik to Thessia is critical. I did that last night, and I can't see why anyone anywhere would think that.
The interaction he has with the Asari commander at the start of the mission doesn't end any differently than when he's not there, instead of Shepard doing the convincing, Javik just uses his mystical space-voodoo. The beacon sequence also plays out exactly the same as it does when he's not there, and, disappointingly, the only direct interaction he has with the Prothean VI is a throwaway line where he tells the VI to trust Shepard, something that it does anyway without Javik present.
So, what's the big deal with bringing Javik here? Am I missing something, or is the mission you "have" to take him on something else? Kinda weird if this is the thing that people are hyping up, like on the latest bombcast. Can anyone enlighten me?