I have a big boi ProLiant DL380e Gen8 and it's pretty good as long as you have a dedicated room for it as it's really loud. If you get them for really cheap like I did (I got mine maxed out for less than 100$), then yeah it's a good deal.
It's not amazing on power consumption either with like 130W at idle... I'd imagine the smaller ones using use less power, but I wouldn't count on it, as it is still old hardware. However, if the price is right, then it could absolutely be worth it... If you can withstand the noise.
And looking at the specs of the N36L, for the same price you could very easily scrounge together a custom build from 2nd hand parts, which will be quieter, faster and most likely use less power...