- Built-in DVD Player - Having a CD player in the PS1 was a nice convenience, but the DVD player in the PS2 was huge. For many people (my family included), the PS2 was our first DVD player and was the reason that we jumped ship from VHS tapes. At the time, the PS2 was a very affordable DVD player and it was a key factor in the success and wide adoption of the format. Hell, my younger brother has a PS2 and still uses it as a DVD player, which says a lot about the importance of this feature.
- Backwards Compatibility - Another major factor of the PS2's success is its backwards compatibility with both the hardware and software of the PS1. You could use PS1 controllers with no issues and PS1 memory cards could be used as well (although these memory cards only worked with PS1 games). The fact that you could carry over your collection to a new console generation made the transition more attractive and basically allowed the PS2 to immediately surpass its predecessor.
- Huge Graphical Improvement - The graphical leap between the PS1 and PS2 era was one of the biggest improvements of any console generation. PS1 games were very blocky and low resolution, but PS2 games were able to smooth things out and start to approximate realistic graphics. Hell, stylized games like Okami and Sly Cooper still look quite good to this day.
- 3D Gameplay Improvements - By the mid-to-late point in the PS2 era, developers were finally starting to get 3D gameplay under control. Camera issues still plagued a fair few games at the time, but gameplay was finally getting refined and control schemes were starting to become standardized in a manner familiar to the games that we play today. This, of course, makes PS2 games much more playable and easier to go back to today.
- High-Profile Exclusives and New IPs - Exclusives and new-IPs ruled the roost during the PS2 era, perhaps to a greater degree than in any other era since, making it a truly exciting time to be a PlayStation owner. Games like Metal Gear Solid 2 and 3, Ico, Shadow of the Colossus, God of War and Final Fantasy could only be played on the PS2, many of which were high-profile third party exclusives.
- My Favourite PS2 Games - Again, this isn't a comprehensive list of the best PS2 games (not by a long shot), but my favourite games of the era include: Splinter Cell (especially Chaos Theory), Metal Gear Solid 3: Snake Eater, Freedom Fighters, Star Wars: Battlefront I and II, Twisted Metal: Black, Shadow of the Colossus, Sly Cooper 1-3, Bully and James Bond 007: Everything or Nothing.