The Deuce is slow because of all the stops and traffic and can get warm in the summer when the door is open and the air conditioning leaks out.
However, it is cheap at $5 a day and covers Vegas fairly well. You can transfer to the other parts of the CAT system so you can hit the Locals casinos if you get tired of the Strip.
What you have to do is view it as part of the transportation solution which can vary from one person to another depending on need and expense. I think the other alternatives are the free shuttles that casinos have and sometimes the monorail when the traffic is really bad.
If you want to see a really good discussion of Las Vegas transportation, there is a new website I found called vegasmadeeasy.com that has the most detailed discussion I've seen. I didn't know about some of the shortcuts to the Strip casinos until this site.