You're funny Krellin... You almost make me think that I missed your rants!
First...
Your use of the word "philosophy" is equivocal. You sometimes use it to point towards something that sounds like "a philosophy of life", a set of values and truths one adheres to in order to give meaning and direction to his actions. Then you use it to point to an intellectual practice.
Now, in the first case, it does seem that the criterion to evaluate a philosophy will be how practical it is, how well it allows you to organize your activities and let you get what you value out of the world and your social interactions. The failures of our belief-systems do in fact suggest that we should look into different systems. Mind you, that's pretty much the sum of some important points Hegel makes (if you want the quotes, let me know!).
As to the second meaning of philosophy...
As an intellectual endeavour, one that has some scientific import (that's another debate, but just give it to me on the grounds that there are, in most "serious" universities and colleges, philosophy departments and faculties), philosophy is probably more akin to a reasonable and reasoned polylogue. That is, its history is the unfolding of a very rich conversation between many thinkers and across time on topics that pertain to the determinations and conditions of our experience of reality. And here, abstraction actually does have a claim to glory. That is, much of what is debated in philosophy are items abstracted from the reality where they are first found. The "game", if you will, is to give an account of those items that is coherent with other such items reputed to be "true". Coherency, then, is a key criterion to determine whether or not a philosophical proposition floats or not.
The fact is: there is no view from "without", no perfectly objective stance we can take on things. Every scientific proposition out there is made from the perspective our humanity affords us, and even our "humanity" is understood from our particular perspective. Who's to say that Hegel or Marx got it wrong in their take on the forces at stake in the unfolding of human history? Sure, we have cases that point to Marx having it wrong, or having overlooked some facets of our reality. But that's not to say that his system is wrong. It's only pointing out limits of its coherence and, simultaneously, of the ways in which it can become something like the philosophy under meaning 1. But within the sphere of its coherence, that is, as a philosophical argument that tries to insist on one fundamental facet of our experience of the world, Marx's shtick is still very relevant. And, yes, true in that sense of the word, true as coherent.
And please note that I've not made "coherence" something like "logical coherence". Logic is certainly a big part of it, but there are various models for logic: modal logic, for example, is quite different from the more traditional, Aristotelian, logic.
As for me...
You want me to reassure you that I'm not that twit in "Good Will Hunting", that dumb ass in the bar that tries to impress girls by citing other people and readings he's done at school. You even seem to hope that I come out as something akin to Matt Damon's character, someone with unrivalled academic integrity. Aren't you the nice guy!
But then, you also seem to assume that I am myself a Marxist...
Marx was one of my very first philosophical reads. When I was ...humm..... about 15 I guess, I endeavoured to read the Capital. I made it through most of it, didn't understand much I would suppose, but I got enough out of it to see how rich his thoughts were. Today, though I can't claim to be a Marxist at all, I still see that wealth in his philosophical offerings. That's not to say I agree with what he's got to say. That's merely to point out that I still consider him a valid and relevant reference, and a fantastic interlocutor (that's for you, Yonni) in the polylogue of philosophy.
As for what I do, or who I am, relative to the intellectual world... Why does it matter? Have I not entertained you enough??? ;-) Can you really say that my words are not my own? Do they not attest of my real interest for the subject at hand? Why would you need my resume on top of it? Some people here know what I do for a living, but I've never told anyone in an effort to prove that I was therefore allowed to say what I was saying. I'm not about to start today.