FWIW I tried a 2L bladder for the first time this past weekend - on a hike where I drank 3L, had a 1 L bottle in my side pocket. In general I did not prefer the bladder/hose/bite valve combo because:
1) too slow at delivering water
2) too hard to drink thru bite valve while breathing hard, because you have to suck it out
3) takes up room in pack instead of bottle pockets on outside, 4) can't tell how much is left, 5) refilling is a pain because it's all floppy, etc.
I just prefer to use a couple 1L plastic bottles that used to have zero-calorie flavored water in there or whatever. Cheap, and fits Sawyer mini on top if needed.
It is slightly nice not to have to make an awkward reach to one's water bottles, but I think I prefer that to all the other shortcomings a bladder has. Glad I didn't spend a lot, but at least I know what I've been missing.