In comparison against the S3, S4 or S5, how do you rate the S2?
Is it better than its newer offspring?
The S2 is certainly outdated compared to the others, but what do you want to do with the others that the S2 can not do?
It came out in Feb 2011. It was the biggest WOW in an era as far as cellphones are concerned and something to really put iPhone in it's place. It was a new benchmark, a new feeling, a new powerhouse in your pocket ... and to top it all, it was small and very thin ... and it is beautiful. The S2 was truly a big punch in a small packet. It was unexpected and arguably the most awaited device in a very long time. Others have tried and failed miserably, but Samsung produced "SPECTACULAR".
It was the birth of the official iProblem and the new benchmark on which other Android device manufacturers had to base their products on or die a quiet death. Apple was so worried and scared that they had to sue Samsung for a patented rectangle with rounded corners just to make the iProblem go away ... but it didn't. The Samsung Galaxy S2 laid the foundation upon which Samsung modelled the later S3, S4 and S5.
When looking at the growth of technology in 2011 - 2012 (the S3), 2012 - 2013 (the S4), 2013 - 2014 (the S5) - it was mediocre, yet another device with more tweaks and add-on's to the user interface, but not really that WOW S2 users got accustomed to. It was definitely better, but still not WOW. The leap the S2 made created an expectation for people looking forward to the S3, the S4 and S5 - and expectation that was difficult to meet.
I honestly think that the only Samsung S phone that is a worthy replacement for the S2 is the S5. And I truly think the S5 is 2 years late. Had the S5 been introduced in 2012, the S2 might have been only a mere glimmer in the tech world. But it is not. It stands proud and it holds it's own.
I also believe that Samsung stopped competing against themselves and started to compete against HTC, Motorola, $ony and other unmentionable manufacturers. That is perhaps why the development of the later models were not as great as the public expected.