Felt sorry for Marcus
Maybe I just liked Jason Weaver's acting, but Marcus really seemed to get the butt end of the show. Always the goofy dumb older brother making the wrong decisions, getting upstaged by his siblings, always cracked down on by his dad.
Something that I found annoying was the arrogant way that Floyd dismissed Marcus' real dreams of being a musician. Goes against a lot of what Floyd always told TJ.
And then there was that episode where Floyd wants to teach Marcus a lesson by having him work as a roofer, only to find that Marcus grows to enjoy it and make it his future. Then Floyd has his buddy tell Marcus a pack of lies about the roofer's life, which leads to Marcus deciding to go back to school, and then after he's gone are we, the audience, shown that Marcus could have had a perfectly decent life as a roofer (unless that in turn was another extreme exaggeration on roofers).
Maybe i'm looking too much into it, but I felt sorry for and sympathized with Marcus on those occasions. Of course, there were episodes where he does some mean stuff, but it seemed to me that he never got his due.
Plus I find it sad that Jason Weaver's career isn't as good as he deserves. His last hit was "Drumline" if I can recall right, and he only had a small role in that.