Many amplifiers on the market greatly overstate what they can actually do. The power output or "Watts" of an amplifier are it's major function, and sometimes products get quite dishonest about these specifications.
You might see something like "175 Watts" stamped on a 7 channel amplifier, but closer inspection of the fine print reveals that is only one channel operating, and at un-listenable levels of distortion. The product is certainly capable of producing that many watts, but only in a laboratory, when plugged into something that's not a speaker. This doesn't give you any real world performance information.
Rotel ALWAYS states power output at expected real world performance. In many cases power rating is actually quite conservative. You will find that a Rotel amplifier can outperform some competitors with much higher stated power output.