My advice: go early, they have a Starbucks if you need coffee and pastries, enjoy lunch there, play the tables. We left around 5pm after a great day of entertainment. We enjoyed drinks, chats and I even made some of my money back. There we had the most fun! The dealer was friendly, we had gotten in before the buy-in went up. In any case, given that the slots were terrible I joined my friends at the 4-Hand Poker table.
Either I had been extremely lucky in the morning or they switched the odds around lunch time before the larger crowd came in to be very low (I played the exact same machines).
After lunch I returned to the slot machines and had my winnings wiped out in 30mns. Many open tables, and it felt really relaxing and modern. We all enjoyed a nice lunch at Tony's (Make sure to sign up for a player's card, on addition to the regular free play, you will collect dining rewards which I used for this lunch). There were few people playing that early and most seemed to enjoy wins. I played slots from 10am to 12pm and was way up.
The place offers a Poker Room, Table Games (Poker, BlackJack etc), Many slots but no Roulette or Craps tables. They were all pleasantly surprised by the quality of the premises, the choices of dining options, and the overall Vegas-like ambiance. Went to Graton with 6 guy friends on a Saturday.