Ok, this is going to be a doozy of a post.
I held back from getting into this game, specifically because I was holding out for the Baratheons (and Stannis in particular). So once they were announced, I was all-in. I bought the starter set a couple weeks ago, and finally played my first game (35 points) a few days ago against a Robb Stark starter-set army, with just the Baratheon starter-set units, Bronn in the Sentinels, and Stannis in the Stag Knights. I don’t have all the experience, but here are my initial thoughts:
Stannis provides abilities that give Baratheon units more teeth on the offensive. While this certainly isn’t a bad thing, between the Baratheon tactics cards and their core unit (Wardens), overall the faction feels like it wants to be more defensive/reactive than proactively aggressive. Their cards aren’t that diverse in their triggers either, and those triggers generally require your units to be engaged, attacked, or [gulp] destroyed. You are mostly reacting to various levels of punishment an enemy unit is inflicting upon yours - engaging it, wounding it, destroying it. There are no card triggers for maneuvering, charging, rolling attack/defense dice, or retreating etc; things that Stannis’s personal unit might actually do. Also consider that when you add his 6 cards into the deck, 4 of them simply double up on preexisting triggers. One of those triggers is the extreme one - it requires one of your units to be destroyed. So that’s now 20% of your total deck triggering off of destroyed units. If this was a horde style army, it’d be great, but how many times can you be expected to play those cards until the bonus effect becomes irrelevant to the game’s outcome? There just aren’t *that* many units to serve up. So by the third play, your remaining unit is probably pretty powerful, but at that point, you’re probably on the verge of defeat anyway.
Now all that being said, I did manage to pull an unlikely victory by the skin of my teeth by specifically playing the objective points. After round 3 it became clear that taking the field by force of arms would be an uphill battle at best. I ended up grabbing my 10th victory point with Stannis’s unit in the final turn of round 5. This was my last unit with only 4 models remaining. If the game had gone to the 6th round, his remaining berserkers and outriders would have obliterated me. It was a tense, hard-fought game, and ended in dramatic/thematic fashion with Stannis refusing to yield to overwhelming odds. As a huge Stannis supporter, this is pretty much what I expected. It’s what I signed up for. If you play Stannis, you do it out of principle. You do it because you believe in the character. Thus, for any true King’s man, the decision is easy; want has nothing to do with it (100% Stannis). That being the case, I am eager to see the rules for the new heroes, because it looks like we're getting an Attachment or NCU version of Stannis. If I can keep him in my army, but use another thematic character as "Commander" (maybe Davos?), then I will probably go for that.
Anyway, for those less than fully-committed to the one true king, then (and it pains me to say this) Renly might be the way to go. He's just a more likable and competitive commander for the masses. His cards seem to jive with the faction better by adding trigger diversity to their faction deck, and boosting unit durability on the field through healing effects. So just like in the story, I’m not surprised that more people have flocked to his banner. Honestly, the fact that this game was able to effectively capture the feel of these characters in this way, is a testament to its thoughtful design.