Im currently on term 2 of the course. Ive found that usually you get replies if you post on here and also provide feedback for others, its not like you get a reply right away but you still get feedback. If you want feedback from Marc you can join the livestreams and submit work to him that way (I cant offer more info on this as the streams are not a great time for me so I've not taken part in one).
Theres also a discord group, its pretty lively in general and feedback. A lot of people there are on the later terms so the earlier term stuff can sometimes be missed. I check through the earlier term stuff when I can and help out and im sure others do too, but like the forum it can take a bit of time before anyone comments. I think theres a facebook group too but I dont know anything about that because im not on facebook.
If anything its a great resource for getting into digital artwork. But the community is great, everyone is very respectful and helpful.
Hope this helps,