Arlington station has changed so much over the years. Thanks to MBTA's efforts of trying to salvage and renovate the very tricky entrances / exits of most green line stations between Boylston and Hynes CC - even Kenmore. I find Arlington especially useful because it is never crowded. At least not as much as Copley is. So if I ever have to take the train towards North Station or in the opposite direction towards BC, I instinctively walk towards Arlington rather than Copley.
I equally appreciate it serves the simple purpose of being a T stop; no dinky coffee store, no news stand, no nothing - just take the train and go, go, go... Not that some of those conveniences won't be useful to some folks, but given how muggy it can get down there, it's best that some stops stay clean and devoid of any extra commotion.
And again, given the tourist population that dominates Copley, for us locals, I am happy with Arlington. It's alright the challenges that one has to face to get on a crowded train (in either direction) during rush hours here are interesting, but then again, you are not competing with 23 other people trying to get into a crowded car from the very same door. That scene is the same at every open trolley door at most other stops between Park St and Kenmore... Not at Arlington (and dare I mention a Sox game day? You know which T stop you will find me sporting a Varitek jersey?!)..... A Happy Local T commuter here who likes Arlington T stop!
PS: If you are visiting Boston, do read Amy B's review on Copley T stop. There are some serious insights about using Copley as a stop that every tourist has to use given the area. read more