What really ticks me off is that I used to be able to have my Intel Late-2006 20" iMac as my gaming machine up until 4 months ago. For some reason many of the games that were advertised as supporting my graphics card no longer worked. I am now forced to use my MBA as my gaming machine, which is probably better than the iMac, but I need a dedicated desktop that can run games you know? Ugh, I just wish I could use these machines like I used to. Still, it makes a good desktop/photo editing computer, and I may throw a 1TB HD in the machine and use it as a personal server that I could access from both my houses.
Yeah, I totally understand what you mean. I experienced this with my original iMac G5, which I got new in 2004 and used until 2010. Sure enough, it became slower on the web and not so compatible. It WAS around 2010, so PPC hadn't been phased out by everyone, but it was sad that I had to ditch it, and that it ended up dying just from sitting. (HD and then GPU). At the time, I only used Safari because I didn't know better. (If only I had discovered Camino earlier on). I WAS glad to get an upgrade, but had I been an enthusiast then, I would have not been too happy. Granted, my upgrade was still a PowerPC Mac xD. A 2005 iMac G5. Getting the 20" screen over my 17" screen was nice though. I was annoyed for a while that my brother was using a---at the time---3 or 4 year-old 24" 2006 Intel iMac, which was a beast of a computer.
I gamed on online-game websites in the day, and, of course, used my 2004 iMac G5 for that. I carried over those same habits with my acquisition of the 2005 iMac G5, and even played Minecraft on it until 2012.