Consider the AVR-X4300H has the same power amp as the AVR-X4200W, take a look of the following graphs and you'll be judge.
https://www.soundandvision.com/content/denon-avr-x4200w-av-receiver-review-test-bench
https://www.soundandvision.com/content/marantz-av7005-surround-processor-and-mm7055-amplifier-ht-labs-measures
View attachment 30267
2 channel continuously driven, 8 ohm loads.....................124.3 W @ 0.1% THD, 149.2 W @ 1.0% THD
2 channel continuously driven, 4 ohm loads.....................215.9 W @ 0.1% THD, 239.7 W @ 1.0% THD
5 channel continuously driven, 8 ohm loads..................... 94.6 W @ 0.1% THD, 118.0 W @ 1.0% THD
View attachment 30268
2 channel continuously driven, 8 ohm loads.....................130,7 W @ 0.1% THD, 152.8 W @ 1.0% THD
2 channel continuously driven, 4 ohm loads.....................215.8 W @ 0.1% THD, 236.4 W @ 1.0% THD
5 channel continuously driven, 8 ohm loads.....................107.8 W @ 0.1% THD, 117.8 W @ 1.0% THD
I think the MM7055 is a well designed amp, just not that powerful, marginally (=negligibly) more powerful than the Denon AVR 4000 series.