Been so long since I played those, not sure I can do a proper review w/ specs and the technical stuff. I would guess these days, they should run at either 1080p30fps or 1080p60fps or better without breaking a sweat. I don't think I ever wrote a full-blown review for those games, oddly enough, as I can't seem to find it!
I would probably do more of a retrospective on those two, if I was to do so.
Those two AC games (AC2 & AC:B) to me really defined the series.
AC2 was the major improvement over AC1 in almost every way (story; characters; gameplay; variety of mission types; became more of a mix of action, platforming, and stealth; etc etc); and AC:B had the major improvement & tweaking of the gameplay aspects (calling other Assassins to help;sending Assassins on side mission; & the addition of bombs as weapons and bomb-making); and introduced their brand of MP to us all (which was basically, more or less, an AC type of twist on The Ship's competitive MP).
AC series has evolved (see AC: Syndicate, which felt like the last proper AC type of game & sequel that AC: Unity should've been) and changed direction a few times; and most of them have been successful. AC4: Black Flag & Rogue headed more into a pirate-y and naval open-world direction (so you did less on-foot platforming to get to areas). Meanwhile, AC: Origins started heading the game into RPG direction with the ARPG loot-direction with Dark Souls type of combat; and then AC: Odyssey continued further into RPG stuff by adding decision-making RPG direction.
Even given all of the above, I still don't know if they (UbiSoft) can ever re-capture that magic that came from AC2 & AC:B.
