OK, so, proud of my 64-bits system I had to try it, despite of an aged configurations. Loading times were quite long, but everything ran properly.
Once in game, I got a decent framerate by chosing low-intermediate graphic settings, which are already pretty good for my standards.
Aware that tutorials are important, I watched the first half of the most basic. Then I decided I was clearly qualified enough and generated a "fast mission" (nice tool there, and the advanced editor seems very complete).
So I climbed into a russian Su-25T all loaded with bombs and rockets by a winter noon, under severe snowing, well-decided to putinize some georgians. Though I slided a bit on the runway (logical with the snow), I was able to takeoff. I had more trouble to stabilize the aircraft and needed several minutes to learn how to fly it in a desired direction without stalling. A good point for the realism.
Then I followed the navigation cue on the HUD and flew at full throttles towards the field of battle, having fun keeping as close to the ground as I could. I almost crashed into a small town, and later avoided an electric pylon by a few meters. That plane has a nasty inertia once launched at 700 km/h + and fully loaded. Another good point.
I arrived over my supposed target and saw nothing at all (of course, given I was blazing and much too occupied to avoid terrain obstacles). Then the russian equivalent of the RWR sent me agressive tones, and I tried some evasive manoeuvers, while having no idea what the alert meant. I decided it was an AAA radar lock warning, and the debrief showed me I was right : an US M2A2 was shooting me at with its 25 mm gun. I wasn't hit though. I flew over a road and saw a vehicle, probably a fuel truck, but so fast I was unable to identify it.
I was of course perfectly unable to launch any weapon, use the targeting systems, or even fire a single gun round. +1 for realism. So, happy to have survived my first sortie, I headed back home. The autopilot kindly brought me in an orbit pattern over the base. I still had my bombs and rockets and no idea how to get rid of them, so I was a bit concerned by the landing. I tried to land fast and it worked. As I could expect given my excessive weight plus the snowy weather, I was still over 80 km/h at the end of the runway. The nosewheel half-collapsed, which braked the plane rather efficiently. I came to a rough stop and opened the canopy. Pfew !
So it was pretty fun, but there is of course a lot to learn to get any proficiency. Which I'm expecting from a simulator. The possibility to have it for free with the Su-25T is very nice. It allows you to decide if you like the sim enough to learn how to fly properly, and if you want to invest time and money into it.