According to Hotel Chatter, hotels with the best WiFi service are (drumroll, please):
Marriott is so close to doing WiFi right. Residence Inns, SpringHill Suites, and Courtyard all have strong, free, fast, working wireless in the rooms and the lobbies.
Furthermore, the rooms at the above hotel brands will give you an ethernet cable, and a free tethered connection if the WiFi in your room is spotty or not preferred.
The lobbies at the above mentioned Marriott's are also perfectly outfitted for meetings--meaning they offer plenty of power outlets and places to sit down and log on. The above video was shot at a Residence Inn and it shows you the mood and situation that is featured in most Residence Inn lobbies.
Finally, in our WiFi hotel testing, we have noticed that newer construction hotels, and low lying hotels, are much more apt to have strong wireless signals. Those old, multi-story buildings can be hard to optimally configure for wireless access.
What does all this mean? Marriott, you are so close. Just offer free wireless access at every Marriott property and you will be the first and only hotel brand to have a consistent free wireless policy.