Meh...I am not sure that I saw enough of his work to actually be a "fan" of his (for instance, I had never ever seen anything resembling that image posted above!). Remember, I dropped comics by 1991, and did not pick them up again until 2006 or 2007. Therefore, everything I have seen of Rob's, has pretty much been in hindsight. I just remember reading some of his comics and thinking that they looked okay; X-Force comes to mind, as does some classics like Youngblood. I always was a fan of Image comics in the 90's when i discovered them, and I beleive Image was founded by Rob and some other frustrated artists.
More than his art, RL for me was always about "fighting the establishment". What little I knew about him, which granted was far less than i know now (the computer is a wonderful tool), for me he was always the little guy with great ideas who struck out on his own and took on the big corporations (and, to a large degree, won). You have to love somebody like that.
The fact that Youngblood was based on heroes he wanted written into Teen Titans when he pitched writing for them (and was subsequently turned down), amazes me. I find him brilliant in that regard. His ability to create fascinating characters, ranks right up there with the greats (Lee, Ditkas, Byrne, Claremont - I think he deserves that type of recognition for his character work).
His artwork - well, for me, the iconic image of his work in the superhero genre as an artist, is the women he drew. God, that man musta had cojones, to draw every woman so incredibly chesty, and actually get away with it! Lol. So, when i think of his art, I think of disproportionate in a whole different sense that what you think when you view that Captain America pic above (shudder!).
As wikipedia states, "In 1989, Liefeld moved to Marvel where he became the penciller for The New Mutants, starting with issue #86. He is generally credited for turning this lowest-selling title of the X-franchise into a financial success. The New Mutants series was retitled X-Force (vol. 1), whose 1991 debut issue sold four million copies, setting an industry-wide record later broken by Jim Lee's X-Men (vol. 2) #1." Dang! That's pretty dang impressive!
That, to me, is the Rob Liefeld I think of. Never written him a fan letter. He isn't gonna make even my top-ten list fo favourite artists. But, creatively, I think he is a genius (much the way I think Alice Cooper is a genius!).
And that's all i have to say about that.