Jack's is three different bars depending on what time of the day you go in. They open at 7am so first thing in the morning it is a night crew bar since that is their 5pm. So you will see nurses, security guards, and construction workers. Around noon it turns into a biker bar. They have special motorcycle parking with Biker Vision (a camera that points to the parking area so you can keep an eye on your baby). After 10pm it turns into a college bar. The place is typically filled to the gills and top 40 is playing. You might get groped, puked on, or sandwiched.
It is a dive bar in all senses. Cheap drinks, crappy floors, and bartenders that have zero time for your BS. All in all it is a fun place if you just want to have a cheap drink and a good time.
The only reason I give it 4 stars instead of 5 is because of their bathroom situation. Occasionally they will get a large group before the back room opens up (the backroom has bigger bathrooms with more stalls) and there will be a line for the single stall woman's room.