Finally got it downloaded and played a few hours today. Checkpoint system isn't as bad as I'd feared from the comments here, at least so far. I bought the game to run around and blow **** up, if I have to redo a battle... well I get to run around more blowing more **** up. But yes, quicksave would be nice if you're stuck at a tricky jump.
Levels are nice and big for a modern maze shooter, it's actually possible to confuse yourself and need the map, although the map is a bit toytown, especially for z-axis navigation.
Artwork is great, sound is good but Doom 3 was way creepier, and had a bit more depth to the story elements, if that matters much to anyone...
Movement is good but it aint Q3 / UT / SS. Feels like Doom Guy has a bad back or something, turn speed seems sluggish to me even with mouse sensitivity way up.
Inventory system is a crap waste of time IMO, just doesn't belong in a fast paced FPS.
Haven't tried MP yet, want to complete the SP campaign first.
£360 well spent LOL, including my awesome new 980Ti... but damn it now I want a bigger 1440p monitor too...