Actually, I did read the posts in order, and was confused. Maybe because Amtrak Blue had already posted her disagreement about including Philadelphia in this list, and you agreed with her (so do I!) and added 3 more to your "good stations" list. My "thread drift alarm" went off.
If we want to say "bad stuff 'bout Amtrak", to paraphrase an old SNL series of skits, I would say the one thing I don't like about Philly is you have to go outside and cross a fairly busy street to get to the subway, which is inconvenient, especially in bad weather. But that is function, not form, so may be off-topic. The building itself is beautiful and pretty well laid out inside.