There were two notable hands where I made the best use of the free information.
I should have made more but got a pretty bad run of cards (I was never dealt a pair JJ or higher during this period). Overall, I made $1500 at this table, with my ante ranging from $15 to $35. I played at this table for 3 hours, during which she was the dealer 40 minutes out of every hour. I would say 60% of the time I could see the exact card, 30% of the time I could tell it's general color and range (e.g., it's paint, or a red middle card, etc.), and about 10% of the time she dealt correctly and I couldn't see it. I was recently at a casino sitting in seat 1 of a Mississippi Stud table and the dealer was lifting the 3 common cards high enough in the air upon dealing that I could usually see the bottom card - the last common card the dealer would turn over.
