My son was always a really picky eater. The buffet in Germany has always been one of his favorite WDW meals. There are two or three "wursts" that taste a lot like hot dogs, so he always loved those. And, as the other folks have mentioned, there are chicken fingers and mac & cheese. My only problem when eating at Germany was keeping him from filling up on the pretzel bread.
(Funny story: One year, it was about an hour after we'd eaten there, and we'd made our way around World Showcase -- I think we were in Canada -- I look over, and see my son munching on a piece of pretzel bread. When I asked him where it came from, he got this terribly sheepish look on his face and pulled three or four more from the pockets all over his cargo-style shorts! He looked up at me and said nervously, "Mom, are they going to kick me out of Disney World for stealing these?" I assured him that since that meal was "all you can eat" it was OK this one time, as long as he ate them (but that he shouldn't do it again). To this day, every time we eat at Germany (always at least twice per trip), we joke with each other as we leave about having pretzel bread hidden in our pants and socks and backpacks, etc... Other people who overhear us must think we're nuts...)
Anyway, to answer the OP: Kids love this place. IMHO, it's the best WS meal for kids in general, and especially for picky eaters.