Why do we love him? PG Porn, of course.

Firefly.
Castle.
Halo ODST.
Nathan Drake.

I'm done.

Because he's just... amazing. He's like Bruce Campbell, you can't really put your finger on why he's awesome, he just radiates geek-cool from every pore.

Aye, PG Porn. And Mal. And Caleb. And Castle. And Captain Hammer. And probably lots more, but that's what springs to mind in ~30 secs.

A better question is, why isn't everyone else in love with Nathan Fillion? He just radiates awesome.

The man is that charming, cocky hero we all wish we could be.

Nathan Fillion is one smooth operator.

Fillion for DRAKE!!! Browncoats unite!

You forgot:

5. Because he's Nathan fucking Fillion!

I rest my case.

Only thing I've ever seen him in is Lost as Kate's not-quite-husband.

Because he's got a hell of a lot of geek credits under his belt. From Firefly to ODST to Doctor Horrible's Sing-Along Blog, everything he does seems to be awesomely geeky. It doesn't hurt that he's a good actor.

Plus, like Chuck Norris, he radiates an intangible yet obvious field of awesomeness.

CannibalRobots:
I'm sorry, but who the hell is Nathan Fillion?

I've never heard of the guy until now, despite maybe seeing him in countless shows/games, he has not stood out for me.

Well, I cant say I hate him then.

My thoughts exactly. The only other time I've heard of him was when people were in favor of him wanting to be Nathan Drake in an Uncharted movie, to which I can only say "Not while Nolan North is still alive!"

Woodsey:
Only thing I've ever seen him in is Lost as Kate's not-quite-husband.

then i pity you

What oher actor on earth?

You forgot point number 5: He's a complete goof and that is hilarious. It could be argued that, when he was handed the script for his first episode of Castle, they told him, "Okay, be you, saying these words."

There is a story I heard about Gencon Indy one year, when the Serenity RPG was fairly new. Word is, he saw a group of people sitting at a table with books with the Serenity logo and name, asked what they were doing, and they invited him to join them. He asked if he could play Mal, the GM gladly agreed, and he fell right into character and role-play-gamed alongside a bunch of bystander nerds.

Definitely goes along with the "everyman" sort of theme in the article. Sure, he's famous, but he's not above other people. Very appealing attitude.

barash:
Aye, PG Porn. And Mal. And Caleb. And Castle. And Captain Hammer. And probably lots more, but that's what springs to mind in ~30 secs.

He also did the voice of Vigilante on Justice League Unlimited.

Summerstorm:
He rolled a 18 for charisma?

Actually the dice were just so damned charmed that they allowed him a 20 instead of 18. He's JUST THAT GOOD

CannibalRobots:
I'm sorry, but who the hell is Nathan Fillion?

My reaction exactly. To be fair, though, I did not watch any of the shows or played any of the games he was featured in.

jackanderson:
You forgot:

5. Because he's Nathan fucking Fillion!

I rest my case.

And nothing else needs to be said. His awesomeness is that indescribable.

Is it bad that I've seen all but one of the things you mentioned? Yeah, I like Nathan Fillion.

For the record: he did Firefly before he was in Buffy (just like Adam Baldwin and Gina Torres went to Angel after Firefly got canceled.), and you didn't say ODST, where I believe Buck was quite a bit more important than Reach.

Oh, he was in Jade Empire? I didn't know that!