I think this really hits the nail on the head. Just like you say with Homecomings, we have very good indian/african food where we live, and Tusker House's food really falls flat by comparison. I think I would enjoy it more if I didn't know what that curry SHOULD taste like and wish it was more authentic.
I think another thing to consider is that Tusker House is quite consistent at all meals, year round, but the H&V menu changes a lot, which may add to the variability in reviews. Minnie's Holiday Dine seems to garner more favorable reviews than the non-holiday menus they have the other three quarters of the year (and I agree, I prefer the holiday menu, but I still did not think the summer options were bad, just not as good). Also, the breakfast at H&V is consistently reviewed as terrible, whereas lunch and dinner food is much, much better. Akershus has the same issues with a much better dinner menu than breakfast. If you follow Disney Tourist Blog at all, I thought it was spot on, and kind of funny, that H&V lunch/dinner is ranked highly in their Best Character Meals blog post, and H&V breakfast is in their Worst Character Meals post.