I think my issue with the kiss was the fact it just didn't seem necessary or even warranted. A massive hug would have been every bit as moving and appropriate under the circumstances... they're friends getting back together after a falling out and time apart, and friendship is valuable enough under such difficult circumstances.
So for me the kiss just seemed 'wrong', and not just in the sense that she's 14 and I'm a bit homo-uncomfortable... though she is and I may be.
Perhaps 'forced' would be a better word, in the sense that -- to me -- it felt like drama for drama's sake. But even if I'm just being stubbornly old school about it, the kiss doesn't stop TLoU being a masterpiece of interactive drama.
But they're not just friends, there's clearly a bit more to their relationship than that even without having to actually define it has anything. They love each other, they're young, still figuring things out, I don't really see how it can be interpreted as forced; a girl kissing a girl as a sign of affection isn't exactly uncommon either. The whole point is that Ellie lost someone - the only person - she loved, and that that does a lot to inform her attitude and behaviour throughout the full game. She loves Joel and will fight to the death to save him as he does for her, as shown in both the game and in Left Behind. She wasn't going to lose yet another person; I don't think that just having Riley and Ellie as regular playful friends would have made that nearly as effective.
I recommend watching this, Druckmann and Straley explain a bit more about their intentions with the whole thing:
I recommend watching this, Druckmann and Straley explain a bit more about their intentions with the whole thing: