Wow, it was awhile ago...
I think this was one of the very first AD&D modules I played, and my memories of it are fuzzy in the extreme. I do remember one of the party's clerics (the player was actually using the cute cleric from the sample adventure in the old Basic Set) getting killed, by a bear IIRC, and the party having to hole up for awhile while she was raised and recovered from that.
My imperfect recollections of playing the module aside, I still consider it a very fine piece of work, and I've actually sat down within the last couple of years and just read it, cover to cover. Rather than a lot of specific memories, it brought back an impression of what playing AD&D way-back-when was like. It actually set me to re-thinking about some of the aspects of 3E that I thought I'd been alright with. Don't get me wrong - I like 3E, but since revisiting Against the Giants I've been thinking of ways to tweak it to recover some of that feeling that we had back in the beginning. So, I guess you could say that the module has been extremely influential on my gaming experiences, albeit 20+ years removed from when I first encountered it.
I did download a couple of 3E updates of Against the Giants, and one of these days (not my current campaign, though), I'll step up to the plate and give a try at DMing it.