Half-Life vs Half-Life: Source

I snatched Half-Life 2 a while back but haven't got around to playing it yet. Partly because I haven't even played Half-Life - don't even own it - and would prefer to play them in order (or does it not matter at all if you know/played HF before playing HF2?).

What keeps me from buying Half-Life is there being two versions and while the decision should be easy (remaster version over possibly outdated original, right?) my gut and experiences tell me that "upgraded" doesn't always mean better.

So the question to those of you who know both version: Is "Source" really just remastered graphics or did they change anything else and in a way that makes the original still superior?

Thanks in advance! :)

Got my answer: the HF 2 mod "Black Mesa" it will be. Thanks again! (and wow that was fast!)