I've never played NL in a casino. I've played in lots of home games, usually around 5 or 6-handed. To me it seems like home games I've been in (which mostly involve people who aren't really serious about poker) compare to $10NL online. Lots of loose calls, minraises, minbets...that kind of stuff. Online it seems like people fold a bit more to me - I guess cuz they have plenty of other things to do while playing and can afford to wait for a better hand. Live games can lead to boredom sometimes and make people freak out when they finally catch a "real" hand like QJo and call down with their gutshot.