Debate accepted!
1) This show is not well written, it is not well structured, the characters are not well defined, the premise is not very clear, there is no tone.
The tone, as defined from the very first scene, is dark fantasy. "Winter is coming" is both in-universe statement about the ending of Summer (plenty and warmth) and plot metaphor. There is a crisis in this world - the white walkers - that threaten to overwhelm all of Westeros. But that also applies to the death of Robert Baratheon and the fall of the Seven Kingdoms into war. So now the very people that could have stood together against this threat are warring between themselves, throwing away the defenses they had and becoming ill-prepared for "winter".
It's all about the Ant and the Grasshopper. Instead of putting in the hard work now, the characters do what is immediately expedient to their goals - and that leads to their downfall.
Instead of building up a power base against Cersi and retreating when he's been outmaneuvered, Ned refuses to compromise his morals.
Instead of acknowledging Stannis' stronger claim, Renly rebels against his brother.
Instead of following his father's orders, Theon sacks Winterfell.
Instead of honoring his betrothal, Robb marries Jeyne Westerling.
Premise (acting today instead of preparing for tomorrow) followed. These characters are all maimed, tortured, and/or killed for their mistakes. Dark fantasy tone? Check.
Now, poorly defined characters - let's use Red Letter Media's test. Describe some of these characters without using physical traits.
Ned is noble, duty-bound, and stoic.
Cersi is a bitter, conniving hedonist that loves her children.
Tywin puts what he thinks is best for the Lannister family above all else.
Catelyn worries incessantly and will compromise her beliefs if it saves someone she loves.
Stannis is uncompromising to the point of psychosis, unconcerned with the views of others, and driven to see his goals achieved at nearly any cost.
Tyrion is mischievous, devious, politically adroit, and intelligent.
I could probably do this for every POV character.
...which, actually, I've read the books. So if you're looking to debate people who have ONLY seen the show, well damn, I'm out.