I did UC1's crushing mode a couple of years ago but it was well after UC3's release. I remember having absolute fear for what's known as "the blue room", because the first time I played through on normal I got stuck there for a really long time. I watched a YouTube vid and nailed it on the first try on crushing, couldn't believe my luck.
Proud of my run through UC2 on crushing there though, because I find UC3 easier so that was essentially the hump to get over since the controls and UI of UC1 have been refined, it shouldn't be as bad. The only real point of frustration I had was when streaming yesterday I kept dying on the train segment, which I've never had trouble with before. I think I had to repeat one segment around 15 times. Other than that I didn't have any problems.
Oh also, discovered a bug on the final boss which helped me immensely. I got stuck inside a random tree and Lazarevic was close enough that he was trying to melee, but the object was in the way. I was in a perfect middle between two of the blue things you have to shoot to damage him and I could hit both from my angle, so it was just a matter of shooting them then waiting for them to respawn. He was down within three minutes, I couldn't believe my luck.