Yes, me too.
I finished it on Normal, and then started going back through it on Heroic, hoping to slowly build myself up to being some Lgendary fighting genius.
But I got to the Silent Cartographer, just after opening the security door, and I just could not be buggered to go through all those rooms and corridors and face the same aliens over and over. Just couldn't be buggered.
I'm hoping that over Christmas, a friend will come round and we can go through it in co-op, otherwise I doubt I'll touch it again for a fair while.