i think its terrible. and i didnt even get past the upper body, legs, upper body part. your legs are about half the mass of muscle in your body and its getting half the attention. if anything i would do 2 lower body days and 1 upper body day. with squats and deads and all their variations you can easily do enough exercises that will even work the upper body a bit. heck, throw in some weighted carries on those 2 lower body days and you just hammer the upper body at the same time.
this is just my opinion. for mass, volume is what matters. and you should do just enough to stimulate growth but not too much to hinder recovery. if you are just starting out you dont need much to grow therefore you dont need as much volume therefore you can workout muscles much more frequently.
drsquat.com/content/knowledge-base/finding-ideal-training-split
read that to get an idea on how to determine for your body a good split. you might want to try out the rep ranges as well to see if they work for you. you may not want to follow it to a tee. but it can at least show you how some body parts recover very quick and others not so much.
if you are just starting out i have been a fan for a long time of a push/pull split. and not worry so much about upper lower other then just do each every day. here is an example of what you can do:
push: bench, overhead, squat
pull: rows, pullups, deadlift
throw in all the variations of each lift and all the accessory exercises to support those movements you can easily have 100+ exercises to choose from.