This is something you can also discuss with your spin class instructor.
Each class and instructor has different appeal which can be motivating (or demotivating) to different people. Some are more lovey dovey we're in this together as a team; others are more competitive/aggro and race away from everyone else. Even with a particular instructor, they may switch the focus of to each class (e.g. "climbs" versus "sprints" versus whatever).
Hopefully wherever you are going has a rotation of instructors and class styles you can sample.
If you're doing this not in a class, it's pretty easy to lookup different spin workouts online (you can even find youtubes and/or audio downloads, (but maybe you are getting what you pay for).
If you want to double up sometimes; you can do a shorter spin class (say 30-45min), but don't use up your whole tank, and then stack on additional strength workout afterwards.
And I'll admit, perhaps spin class overall is not motivating for some and you'd prefer to do something else, and some people will always look down gym folks and why would you want to spend time in a sweaty gym when you can do the "real thing" outside, but that's beyond the point. (see discussions on why don't you just learn to ski powder on skinny skis for similar logic)
Look into yourself, and if your alternative to the gym is sit on the couch and watch the game, and getting out on a real bike is a ludicrous proposition (to you); perhaps spin class is enough of a "crutch" motivation for you to at least get in a workout and reach your fitness goal.
Edited by raytseng - 5/23/15 at 10:07pm