Games I've been most hyped about playing - not necessarily my favourite, by platform...
C64 - Creatures 2, by a mile. I remember Commodore Format ran a game update article by the Rowland brothers, who were the developers of the game, each month. Hype level was 10,000 by the time the game came out. Felt like so long waiting for it, but it was probably only 6 months at best. When it came it, it certainly didn't disappoint. To this day (about 29 years later), I've not completed the game!
Sega Megadrive - Wasn't massively hyped by a game in particular, though the iconic game was obviously Sonic the Hedgehog, so that was the first game I wanted to play when I got the console.
Original PC (486DX2 66mhz) - DOOM, played it at my mate's house, on his Dad's PC... when my Dad finally got a PC, this was the game I really wanted - closely followed by B17: Flying Fortress.
Playstation - Probably Gran Turismo was the game that made me want to get the console, but my hype for GT2 was off the chart, I was even dreaming about it.
Playstation 2 - Overall, probably Grand Theft Auto: San Andreas. I was really excited for GT4 too, but I think Prologue and Conept had quelled the excitement a bit
Playstation 3 - Probably GT5, or GTA:IV, I remember getting caught up in the hype here once the GT5 leaks started, that seemed pretty major, but the wait for GTA:IV felt immense, and that brought with it a lot of hype. The first trailer was pretty mind blowing.
PSP - Basically bought it to play GTA episodes, but it broke, so I bought another, and that broke, so I gave up, very little hype.
Playstation 4 - Red Dead Redemption 2. The first one had been such an incredible game, and a real sleeper for me - it passed me by totally when it was first released, but it was epic. I was definitely more excited for that than GT Sport, though that did bring with it some pre-launch excitement, the scaled down nature of it, and the online element meant I didn't even get a console till after its release.
Current PC - Bought it to play Cities: Skylines... so, that I suppose! Maybe I should be getting hyped for the Airports DLC
Playstation 5 - GT7, I'm not that hyped yet though, to be honest, perhaps closer to release. It's going to be great, I'm sure, but since GT4 the games have failed to live up to my hopes... I very much doubt 7 will be any different.