That doesn't mean that it's not already overdone.. but lol.
This is what I think:
Musicals in general- I'm all for it, whether it's from a broadway show or a TV theme song. I'm planning a few of these myself because they're easiest and I'm terrible with playwright. Of coarse, some songs are WAY overdone.. if it's a good skit or not, most people lose interest in watching them because of the 'AUGH, not this again!!' thought. I think my favorite musical was in the Wasabi Animusical or something like that with Lupin III in 'One Jump'. It was a song people never used in skits but everyone knew, applied perfectly, and was carried out phenomenaly(Geez, I can't spell). Here it is: http://www.youtube.com/watch?v=lEP6Sh8GL1M
Lip synching- Doesn't bother me in the least. There's always a way to make it work. It's also a way to not have to ACTUALLY sing, and why else would you choose the song if you were going to rewrite it? Well, maybe a couple of lines, but those don't hurt too bad. Usually it's the concept in itself people laugh at with a few well placed jokes or some emotion. At the same time, you have to MOVE right. If you do it right, most won't notice. If you do it WRONG, everybody'll notice. Overacting = Laughs.
300 Parodies: I personally think these are funny. If I see 2104917 with the SAME joke, I'll get ancy and hate it, but some have been pretty good. I saw an Ouran 300 skit where it was supposed to be the theme for their in-club cosplay. It was pretty impressive. The jokes had the crowd roaring, and the way Tamaki moved made me giggle profusely.
Avenue Q: They weren't that funny to begin with. I usually see them with people doing NOTHING and living off of the initial idea of who is singing to who. It's BORING. Of course, with some creative-ness, a group can make one hell of a show.
Dance offs- Never impressive. It kills shows. Sorry.
Fanservice- This is for the fangirls. They'll yell and scream horribly. For example, I'd LOSE A LUNG over screaming at clever twincest instances. If they're not impressive, however, I just blink. I'm a fangirl, but not the kind that'll settle for anything. I'm generally a picky person to begin with.
Naruto- Stop doing the NaruSasu. It's not cool. I think they need to use Neji more [[Can you tell he's my fav?]] and some other side characters. Everybody cosplays the same person. I'd like some Naruto skits if they weren't the SAME THING ONE AFTER ANOTHER. You think you're imaginitive... but you're really not. It's subconcious that you just want to fit in and please the crowd a lot of the time.
Mainstream walk-ons: Examples are Naruto saying Believe it, Ed Elric having a hissy fit about being short or milk, Haruhi groaning and telling Tama/Hika/Kao she hates 'em, DDR/Guitar Hero pretending to be in the game, ect. It's all the same. If you're Ed Elric or Naruto, make a REAL skit. Subtle jokes are better. If you're Haruhi, make implications and don't make the scene revolve around 'GOD I HAET U GAIZ LOL'. If you're a DDR/Guitar Hero character... Don't do a skit. Haha~ Unless you're really playing an instrument.
Contest Skits: I'M BETTER THAN U! Augh!! GTFO PLZ! These are my pet peeve. Back to DDR and Guitar Hero, they could just say:
"JOHNNY, I'm better at guitar!!"
"No wai, I'z so much better, Pandora!"
"BABY LON, I DANCE ON STANDARD"
"WELL.... I DANCE ON HARD!"
Ahhhhhhhh... I'd love just once to see Sasuke come to Itachi with a curly moustache and say "Hello, my name is Uchiha Sasuke. You killed my father. Prepare to die!"
Indigo Montoya = <33
Or the OHSHC making a rennaisance cosplay day and Tamaki saying that in a cheesy tone to Haruhi, just as a side joke. I'd lol my face off.