When sitting at a new table, there are some certain numbers that stand out in the first orbit or two. A guy playing 65/5 or more is going to play alot of hands no matter how small the sample. If it's a little rush. you will be seeing the cards to know. If a guy is 4/1 after orbit 2, he's maybe on a cold deck. But he's never going to open up and play just anything either.

Yes they are the extreams, but when sitting at a new table, I would think these are the only players to avoid or attack, while playing an early, tight ABC type game, until the table becomes more clear.