Posting first, and will read the threat later so that I don't steal other people's opinions
GTA SA may not be the best game ever (for me it is a close tie between SA and 3 and I would usually nominate one or the other depending on the circumstances), but it certainly is one of the very few.
OK... Moving bumpers. First bloody thing I noticed when I started the game. Who cares about anything else when you can damage the bumber and it willl wobble around? Very realistic and so enjoyable.
Then, the countryside. Had fun time exploring it on a bike while gaining the riding skill. Instead of time being wated, I explored the diverse Red County and the city itself, before being dropped off at Angel Pine. This was probably the most athmospheric moment in the whole game. I am standing alone in a middle of nowhere, don't know the map, don't know the village, no weapons and nature anywhere you look. An absolutely brilliant feeling.
Then came SF and I loved it for bearing a close resemblance to my home city. Architecture, weather, viewpoints. Great city.
Then came the most fun part - driving Monster, jumping off the plane, heist - a huge variety of missions packed in the desert part of the game.
So, to summarise - absolutely beautifully re-created wild nature and cities - all of different types and styles, diverse and challenging missions, and even a nice storyline - I only started to appreciate it on my second run though. A lot of nice useless abilities which made the game very realistic - buying drinks, for example. And of course myths - no other game would chaing people to their seats doing nothing but looking for myths instead of doig missions. That's a damn good achievement by the developers.
I had it given as a gift (best gift in my life), before that I played VC and wasn't even going to buy SA as I couldn't afford it (£29.99 back then I think, though worth every penny). The only games I played and enjoyed or played after finishing the storyline are WOT and Mafia 2. None of the other would compare to it. And it is not resource hungry at all - I could run it on my Celeron 3 (I think, 450Mhz CPU and 128Mb RAM and 64Mb Graphics card) which was a farely OK computer back in 2005 and only failed to complete the Stowaway mission because of it being too slow.