FH1:
Bought a new PC in 2003 around the time when BF1942 came out, and I was hooked for months. I'm the kind of gamer that never really looks beyond games so to speak (to see what does and doesn't work), I just take a game for what it is and go along. And I loved BF1942 for what it was, despite it's simplified battles and hardware.
Then in 2004 when my nerdy IT friends showed me the concept of mods and what was being made for BF, a whole new world opened up for me. First was Desert Combat I think, followed by FH1, Eve Of Destruction and that Star Wars mod I keep forgetting the name of. But the SW mod went no where and out of my friends I was the only one who really was into the whole WWII era, while they were more like "dude, you can fly Apaches and MiG 29's in Desert Combat, why bother with those oldfashioned prop planes?"
Eve Of Destruction somehow got lost in the storm (and replaced by BF:Vietnam) and I basically played FH1 for years. It's funny that it is at least 3 years since I've played it last, but it feels like last month. Can still easily visualize the levels and the epic experiences. Pity that when BF2 came out the FH population began to dwindle to the point where I couldn't find any populated servers anymore.
FH2:
When BF2 came out I still had the same PC so I couldn't play it, or the early FH2 version. A friend of mine who played a lot of vanilla BF2 installed it but he didn't like the hardcore-ness of it all. He was more into Desert Combat at the time, so BF2 was enough. But I liked that first glimpse of FH2 (Alam Halfa was the first map I played) but I at first hated how slow it was and unforgiving it was. Not the overall game, but how slow the movements were. When running it felt like you were running through mud, and you could only run short distances. Flying bummed my out too, at first, because of the wonky cockpit view.
But around 2007 I got a new PC that could sort of run BF2 and since then I've played nothing else and gotten completely used to the different game dynamics of the BF2 engine.
I don't keep track of different versions (or the big changes made within), but I like that FH has become more beautiful with every new update. For a game that's basically 5 years old, it's amazing. FH dev's, I salute you!