I guess it depends on who you mean by "us" ...
http://www.cubanet.org/CNews/y05/ago05/31e6.htm
Public transportation in Havana worsens
HAVANA, Cuba, August 29
(Ariel Delgado Covarrubias / www.cubanet.org)
- A worsening of public transportation in Havana has caused grumbling among those who depend on the bus service.
"This unbearable," said a youth at a bus stop at the busy corner of Boyeros and 100. "I've been waiting for two hours and the buses don't stop." There were an estimated 80 people waiting at the stop, while dozens more awaited buses going in another direction.
[ ... ]
How good is this source?
http://www.wcities.com/en/guide/getting_there/154/guide.html
* No bus service currently exists from the airport into town.
* Astro Bus (Gua Gua public transit) is the national public transportation service in Havana. Mainly for locals, the public buses run on no apparent schedule, have no air-conditioning, and are very crowded. If you choose to utilize this mode of transportation, keep an eye on your personal belongings.
* The train system in Cuba is not reliable or comfortable, and does not run on a set schedule, yet it can provide a valuable cultural experience. Avoid using the train if your trip lasts less than 10 days.