I'm not so sure I agree. DL's lounges are usually well appointed, but they have a ways to go in terms of amenities:

DL - open bar, but no free WiFi, no free continental breakfast (just granola bars), weak snacks (crackers or party mix)

AS - limited bar, free WiFi, continental breakfast (bagels, muffins, yogurt, fruit), nice variety of snacks (chips, cookies, fruit, veggies)

CO - open bar, free WiFi, continental breakfast (bagels, english muffins, donuts, apples), snacks (chips, cookies, apples).

NW - open bar (self service), free WiFi, continental breakfast (bagels, donuts), snacks (cookies, fruit, veggies)

I think NW has the best bar, AS has the best food, CO has the best chairs, NW (new style) has the best work areas. Overall, I like the AS lounges, followed by NW, CO, then DL.

Can you tell I spend a lot of time in these places?