Maybe I need to see some examples of how the tone was drastically different in ME2 than it was in ME and ME3. ME3 is certainly the most somber simply because the situation is just coming to a point and nobody knows if they're going to make it out of this alive. ME2, if anything, had a bit of a defiant edge; Shepard seemed to get renewed strength as s/he was slowly rebelling against TIM. I don't really see how it's lighter or more humorous... certainly walking through dead cities with that creepy music playing in the background can't be described as light. The death of Tali's father, the touchy encounter with the Virmire survivor, the introduction of the ardat-yakshi... I'm just not seeing it.
To me the tone is wonderfully consistent and I'm assuming/hoping MEA will follow suit. I expect to see a bit of hope and excitement injected into MEA that we didn't really see in the trilogy, which was understandably a bit more doom and gloom.
I didnt mean bad, I think the paragon/renegade options were most fun/best in ME2.
However, the whole experience feels actiony, its hard to pinpoint, its a lot of things, from how your team mates yell amazing or whatever, whenever you score a headshot, to armor or lack of armor/helmets in space, and overall interraction. It felt like an action movie rather than a fight against impossible odds. In the entire ME2 I never felt like we couldnt make it. At the same time, I had a panic rush when first speaking to Sovereign in ME1, and he reveals that relays and everything else is left behind just to guide us along the paths they desire I just wanted to run out of that room and rush to the council 
Silly, I know.
Huh? ME1 is also ridiculously cheesy - we've got the constant talk of Shepard being the ubermensch (I mean, it's not quite the Jesus-level of ME2, but it's not exactly subtle), all of the various "Big Damn Heroes" moments, the whole dialogue between Shepard and Sovereign, stuff like the 5th fleet showing up to dramatic music, etc. etc.
I thought ME2 was the darker of the two games.
All ME games are cheesy to a point, but from all Sci-fi universes that I follow they kept it most "realistic".
Which was kinda thrown out from the start of ME2 with resurection and all that followed. A man is brought back to life after 2 years being dead, and all you have to say is "I got better"? And no one acts shocked when hearing the news, everyone acts like its an everyday occurence.