Let me jump in on the conversation. BGW is probably one of the best parks I've been to. The scenery is just incredible because the park revolves around the "Rhine River." I went last summer and it is the greenest theme park I've been to. The theming and music is great and best of all, it is very clean.
For the coasters, yeah it only has 5, but all of them are great. Alpengeist is the best inverted ride I've been on, even though there is a trim at the very first. The first drop on this coaster is very unique and if you look down you will have quite a view. My favorite inversion was the huge verticle loop, no pause at the top, very intense. If you are not dizzy at the end, you've been riding coasters more than I have.
Apollo's Chariot is my favorite steel coaster. It is superb. The seating design gives you lots, lots, and lots of airtime. I think it's like 26 seconds total. Again the first drop of this coaser gives you a great view, and you will be out of your seat all 21 stories down. The third drop is also cool, because it is banked, and at the base of it, you are skimming over the "Rhine" River. When you ride it, your hands and feet must be up and out. AC is unique like all the coasters at BGW, because it is built into the the land.
I agree w/scooter on the roughness factor. After riding the park's 2 B&M coasters, there is really no comparison to the older ones. Nessie and the Wolf are good, but a bit rough. AC/Alpie were glass smooth. But other than the roughness, the older ones are great and long! I strongly encourage you to go!
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-Josh