in my case: yes, quite strongly but in a fraught way. the more-common attitude towards marx on this site is that his ideas are entirely bad, whereas I think they're just mostly bad. i'd be open to discussing this more if the person asking the question were to narrow the question and specify what they feel is at stake in it, a little more.
by looking through the tags you can easily find other questions on this topic, which might or might not be helpful. additionally i'd suggest the SEP article on Marx. these might help you figure out what it is you want to ask - feel free to come back if so...
(by the way, the name of his collaborator is Friedrich Engels)