OP:F has in general very realistic weapons, including sniper rifles. Sight distance is ~1200m IIRC, so plenty of opportunities to snipe at realistic ranges.
But, I don't know about the multiplayer community of OPF these days. Others have said that there is still a substantial following... sounds good. When I played it a few years ago, it was certainly not hassle-free with all the patches, additions and mods floating around.
BTW, isn't Flashpoint 2 due soon?
Far Cry has also a long sight distance (1000m) and large open areas, and I've read a lot of comments about powerful sniping in the game. Maybe you could check some FC sites or forums if that's still the case. In singleplayer, the sniper rifle is certainly a powerful weapon in FC - the scope is zoomable and quite steady in the prone position, less so when crouching or standing. I haven't played FC multi, so can't comment on that.
Sniper rifles in Day of Defeat are realistically powerful, but the maps are a bit constricting. And that was a couple of years ago, dunno what the situation is now.
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