The only thing about the kiss that bothered me was the fact that it's their first kiss and it was witnessed by Perry, Jenny, and Steve, and Zod. It was more of a relief 'we've saved Metropolis from the World machine and survived' kiss. In that light, it wasn't very romantic.
Lois can probably get away from any residual problems with the kiss by saying "come on, he just saved my life, it was a spur of the moment kiss, it didn't mean anything", and since she and Clark clearly have a deeper connection and are good at saying one thing and meaning something else as we saw in the last scene, it will probably work.
