Except for the hanar who reveres Javik, as well as the indoctrinated diplomat who attempts to annihilate Kahje because of the Reapers' connection with the Enkindlers. I do agree that they, along with the elcor, should have been a bit more prominent in ME3, though.
Well the indoctrinated Hanar mission is fairly lighthearted (with Kasumi alive) for a vanilla game quest. The diplomat is more of a bumbling idiot then an actual serious threat, despite the fate of an entire planet's population being at risk.
And the Hanar with Javik only had like 3 lines of dialogue; most of which were "This one is not worthy!"
A bit more prominent is putting it lightly (IMO), at best the Elcor, and Hanar got small cameos in ME 3, despite the game being about a galactic invasion, and the need for the races of the galaxy to band together.
Irksome "Big stupid jellyfish" line precisely originated from Mass Effect 1, and apparently enough fans liked it that the ham-fisted line was delivered twice more. And leave Blasto alone, he's a magnificent character even if he's comedy action movie hero.
I have no problem with Blasto, per say; he's like Conrad Verner, in the sense that he is a reoccurring joke in the series; my problem is that Blasto has become the "face" of the Hanar, thereby relegating them to joke/meme status. It would be like Conrad being the only prominent human we ever encounter in the trilogy.
Its not its lack of replayability I find irking, its the whitewashing
For me the ME 3 Geth treatment is slightly about this, but more about how they suddenly don't see themselves as being truly alive, and that only by becoming like us could they become whole.
I liked ME 2 Legion for his robotic (no pun intended), detached, and logical outlook on the Morning War. He admitted that the Geth did great harm to the Quarians in the war, but he never apologized or tried to justify it, he stated the outcome as a logical fact. The consensus mission in ME 3 is none too subtle about trying to justify the Geth's rebellion, and force the blame solely onto the Quarian's shoulders.