...Ive been playing games for a good 25 yrs now I must tell you that I never heard of Fall Out before now.
This tells me a few things about the original company that made the game. One the first two games might have been good games but not great. Because obviously not every joe shmoe and his/her brother was scrambling to get it at the times of they releasaed the first 2. Now I personally know atleast 7 peeps in RL who I talk to play FO3 now that had not heard of the previous games. They also know Fallout Lore because of it. Also the company in question seems to be in a bit of financial trouble. In today's market you need to balance what you put into a game and how fast you release. If you lean to far either way your going to fail. No way around it.
Yeah, like Gizmo said - popularity isn't always going to be all that accurate a judgement of quality, when we're talking about videogames. There's plenty of high-quality games out there that never sold well. I thought Beyond Good and Evil was one of the most well-constructed and compelling Adventure games I played on the last generation XBox, but judging from the sales I'd wager there's quite a lot of people that either never of heard of it or don't know much about it. If I mention Starflight, Zork, Pirates!, Xcom, or Ultima to the average gamer they're probably not going to know what I'm talking about - but that doesn't mean those weren't good games just because they didn't sell well by today's standards. (Those of us on the forums might get the references, of course - but just by virtue of posting on a videogame forum sort of means you're of a certain class of Nerd...
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And vice versa - just because everyone knows about a game doesn't mean it's going to be all that good. I'm sure even the most casual gamers generally have heard of Resident Evil 5, but it's not exactly the best game out there.
Lastly - of course there's merit to the original Fallout games. For starters, the first one sold well enough to warrant rushing out another sequel within a year of the first game's release. And let's not forget that Bethesda thought those games were great enough to bid on the license from Interplay and make their own Fallout games. If Fallout 1 and 2 were just average games were destined for oblivion - then why are we now playing a Fallout 3, ten years after those games released?
Not everyone is going to like Fallout 1 and 2. In the same way that not everyone is going to like Fallout 3. There's probably quite a lot of people out there who don't any of the 3. Myself - I happen to like all three games. But I don't like in Fallout 3 all the sames things I enjoyed from the original games. For me, I think that qualifies as a disappointment. I honestly don't see any reason why I shouldn't be able to enjoy all (or even the most crucial) things I enjoyed from the original games along with the additions brought to the table with Fallout 3.