Finished
Batman: Arkham Origins just on the cusp of it becoming annoying. Maybe
just past that cusp.
I collected all the data packs because the collectible finder feature was nice, but as I've mentioned more Data Handlers being added over the course of the game meant more data packs being later revealed... if I'd known there would be 200 total collectibles, I would not have started the task. The Riddler resolution is also a clever tie-in to
Arkham Asylum, but was ultimately frustrating, which almost counts as being immersed in Batman's position. The data packs hidden in building interiors were doubly annoying because a lack of Quick Travel options meant navigating not only all the way
in, but
out again. The GCPD and Royal Hotel were the only real offenders here. Egress is a bitch.
Having task-related progression was a nice feature, but I didn't notice it early enough, so start the stealth-focused track was impossible to finish because I ran out of Predator encounters.
It was also the crashiest Batman I've ever played. An extended play session would eventually crash; I probably had full system freezes 8 times, and two more where I could still quit to Dashboard.
Having 250 Gamerscore tied up in tacked-on multiplayer is also fairly mean-spirited.
Everything else was awesome. Writing was the best in the series. Everything seemed to have a Batman-esque reason for doing it. The art direction was superb; I knew where I was in the city by visual style, a series first. Sound was also great; pretty sure they were using Wwise's adaptive soundtrack feature. I just really enjoyed how much the detective work, building cases with evidence, and zooming around beating mooks and roping in crime bosses made me feel like Batman. Just great.
I think I asked someone from Aksys on GAF years ago what the reason was for the slow ass text crawl and got an "immersion" response so 
Any time a game is causing players to think "Why is this goddamned text displaying so slowly?" or "Why can't I press a button to get it to skip this scroll," the immersion excuse goes out the window.