From a spectator view with basic to no knowledge of WA, could find watching a warmer tedious. That's because they do not understand what is happening and the tricks people perform. Having said this, I personally find warmers tedious and a waste of time. It is like a sandbox, free roam. Eventually you will get bored of it. You get much more from other rope games than a warmer because there's more objectives to do, and fun to be had. Warmer is just a niche scheme for a few select people and their acolytes. Real skill is shown in other rope schemes, not aimless spectacle of showoff. Of course I am speaking for myself. Then again I do not see any warmers on wormnet as frequently.
Warmer is more artistic than any other scheme and for me it's the top of rope schemes in terms of skill. Because there are no limits. In RR you go through the same paterns all the time doing the same moves with muscle memory. Roper offers more variable roping but it has it's limitations and has a serious luck factor.