WHY are they so good!?!?!?!?

The original song is called "Bills Bills Bills" by Destiny's Child:

At first we started out real cool,(cool)

Taking me places i ain'tnever been

But now your getting comfortable

Ain't doing those things that you did no more

Your slowly makin me pay for things

Your money should be handling

And now you ask to use my car (car)

Drive it all day and don't fill up the tank

And you have the audacity

To even come and step to me

And ask to hold some money from me

Until you get your check next week

(bridge)

You triflin',good for nothing type of brother

Silly me,why haven't I found another

A baller, when times get hard he's the one to help me out

insted of, a scrub like you who don't know what a man's about

(chorus2x)

can

you pay my bills

can you pay my telephone bills

can you pay my automo'bills

then maybe we can chill

I don't think you do

so you and me are through

now you been maxing out my card(card)

give me bad credit,buying gifts with my own ends

haven't paid the first bill

but you steady heading to the mall

going on shopping sprees

peprpetrating to your friends that you be ballin'

and then you use my cell phone(phone)

callin who ever that you think at home

and when the bill comes all of a sudden you be acting dumb

don't know where none of these calls come from

when your mamma's numbers here more than once

(bridge)

(chorus 2x)

(bridge4x)

(chorus4x)

This one's called "When I get you Alone" originally sung and written by Robert Thicke:

Oooh...
Eah!
[Verse 1:]
Baby girl, where you at?
Got no strings, got men attached
Can't stop that feelin' for long no
Mmmm
You makin' dogs wanna beg
Breaking them off your fancy legs
But they make you feel right at home, now
[Hook 1:]
(Ooooh)
See all these illusions just take us too long
(Ooooh) And I want it bad..
Because you walk pretty,
Because you talk pretty,
'Cause you make me sick
And I'm not leavin', till you're leavin'
[Hook 2:]
(Ahhh)
Oh I swear there's something when she's pumpin',
Asking for a raise
(Oooh) Well does she want me to carry her home now?
(Oooh) So does she want me to buy her things?
On my house, on my job
On my loot, shoes, my shirt,
My crew, my mind, my father's last name?
[Chorus:]
(Ahhh)
When I get you alone ('lone)
When I get you you'll know baby (know)
When I get you alone ('lone)
When I get you alone now (it's all mine)
(Ahhhh....oh)
Come on
Oh yeah-yeah
[Verse 2:]
Baby girl you da shit
That makes you my equivalent
Well you can keep your toys in the drawer tonight,
All right
All my dawgs talkin' fast-
Aint you got some photographs?
'Cause you shook that room like a star, now
Yes you did, oh
[Hook 1:]
(Ooooh)
All these intrusions just take us too long
(Ooooh) And I want you so bad..
Because you walk city,
Because you talk city,
'Cause you make me sick
And I'm not leavin', till you're leavin'
[Hook 2:]
(Ahhh)
So I pray to something she aint bluffin',
Rubbin' up on me
(Oooh) Well does she want me to make a vow?
Check it
(Oooh)Well does she want me to make it now?
On my house, on my job
On my loot, shoes, my voice,
My crew, my mind, my father's last name?
[Chorus:]
(Ahhh)
When I get you alone ('lone)
When I get you you'll know baby (know)
When I get you alone ('lone)
When I get you aloooonnnnne
Yeah
Yeaaahhh...

The Dalton Warblers with Blaine (Darren Criss) at the forefront are amazing! (Needless to say that I have a little crush on Darren Criss :P) They make each episode that much better with every song they sing! It makes me feel sort of guilty for rooting for these guys even though they're the competition...
It's impressive that some of their songs are even better than the original: i.e. Katy Perry's Teenage Dream:

And yes, I did catch up with glee, and the songs, more than anything else, were beyond belief good. The show has upped the ante in terms of their performances which have gotten more and more extravagant (for example, the mash-up of Thriller and Heads will Roll) which is a good thing... for now. I just hope the plot doesn't suffer as a result.
For now, I have only good things to say for glee~
:)

PS: You should check out both the original songs: "Bills Bills Bills" and "When I get you Alone". They're really good and the glee versions are admirable tributes to them.