Dorkiest dialogue in the series

Haha, I've had the line trigger the other day while being solo in Arrival. Walked into the Project living quarters. There are three or four guys there. Shepard: "We've been spotted!!!!" Yea Shep, who exactly are you telling to? Are you talking to yourself in pluralis majestatis now? A bit arrogant, don't you think?

When mordin sings

"I am the very model of a scientist salarian, I've studied species turian, asari, and batarian.
I'm quite good at genetics (as a subset of biology) because i am an expert (which i know is a tautology).
My xenoscience studies range from urban to agrarian, I am the very model of a scientist salarian"

Everything the enemies in ME1 say : "ENEMIES EVERYWHERE!", "GO! GO! GO!"*, "I WILL DESTROY YOU!" definitely belongs in this thread.

*I had to laugh when Alec Ryder says this in ME:A.

My head canon is that it was only said once in the entire series... and it just keeps echoing across space like a misfired missile (per the drill sergeant's description in ME2)

Mordin's dorkiest lines are during the derelict reaper mission in ME2.

First, after killing the last bunch of husks, just before entering the airlock to the ME core, Mordin will say "Only task remaining is to overload the core."
But Mordin, we haven't found the reaper IFF yet, you know, the actual reason why we came here in the first place. Remember?

Then, 2 minutes later when we actually find the IFF (conveniently just before you get out of there), he will say "Cerberus found IFF after all. Present location of research team unknown."
Wait, what? We just fought through about 20.000 husks and we saw the dragon's teeth, hell, Garrus and I even commented on them at length. Who do you think you were shooting all this time just now?

Dam, I always thought Mordin was the smart one but during this mission, he really has a brain failure or something cause he makes no sense at all.

Joker! Get the Normandy airborne and lock in on my signal! On the double mister!

I was about to comment the same thing. A lot of the Liara romance dialogue is super cheesy. Even in ME3. In fact it was the reason I switched to Kaidan in my current playthrough - "I want to spend my life with you" is not something my Shepard would say. To anyone.

"The war was lost. If you had surrendered, they might of let you live."

-Dumbass Shepard to Vigil. thankfully this line is optional

It would have been fine of ME3 hadn't ruined it. Imagine if the Reapers were a cosmic force. No beginning and no end. They were simply always there to do whatever the universe required. And if they'd followed the Dark Energy idea it could have even made some sense. But as written, yeah, it ended up being pointless.

Everything Shepard says in Shadowbroker DLC, really. I'm surprised there isn't a mod to cut out some of Shepard's dumbass "hi stranger my friend Liara is after the Shadowbroker" and "omg you were the bad guy all along no way" crap. If there is such a mod that I missed out on, please share so I can enjoy Hagalaz without enduring all that stupid dialog

Tali's singing.

To call it cringe would be understatement. It's so bad it's painful.