Well that's your prerogative. I'm not a fanatic who would brag about WP's merits (my blog is with WP, and I like it here, but I also contribute to a Blogspot blog, and I think they simply have different pros and cons). But I don't think this particular problem should be the decisive factor in your choice. You are right that it could or should be instant, and I think it often is so, but Saturday probably does play a role too. To me, wanting to abandon WP because of a 2-hour delay in this is somewhat exaggerated.
The only thing I can add is that I've been a regular in this forum for 9 months now, and I've only seen this complaint once. (If I remember well, the blogger reported that his credits showed up after 14 hours.)