I personally played it some time after Portal 2, probably 2015 or so. I found it great, particularly as far as lore and pacing are concerned. Sure, there are bits that drag, characters that aren't well written, and plot/lore details that are too ambiguous, but I'd much rather that than hand-holdy, surface-level plot of most similar shooters, or plot told through YouTube videos and flavor text like many modern shooters. IMO, its still one of the best at what it does, and its still a personal favorite for that reason.