I don't drink coffee so I can't speak to their particular cup of joe. However, I've eaten their twice: Once for a sandwich and one a muffin. The sandwich was subpar. The muffin was pretty good. White chocolate something-or-other.
It's not that Charlie's has personally offended me or anything - it's just that I would prefer almost any other restaurant in existence to inhabit that spot instead of Charlie's. If I'm forced to grab a snack in the law building, Charlie's is it. The vending machines never take my debit card (idk why) so I'm forced to eat an overpriced, ok muffin. It's unfortunate. At any given restaurant I can at least find one item that's not too expensive that I like. Not Charlie's. It's an anomaly.