I think based on the 5* rating, Arsenal is pretty awesome and you should go. There really isn't much to say that hasn't already been said, but I have swung in Arsenal almost every time I have been in Lawrenceville (which is ... a lot more times than I am prepared to admit on this forum).
They do a really nice job of maintaining a variety, both seasonal and delicious favorites. For example, last week they had the apple cinnamon on tap. Its obviously not apple cinnamon season but then again, why not?
You can get their tasty cider treats all over town now too. One of the greatest moments in Pittsburgh bar history was probably when Fat Heads got rid of Framboise taps and replaced them with Arsenal Cider. If that's not true love ... I don't know what is.
Also - if you do swing by, and haven't been ... grab a growler (first growler will run you $18-24 for the bottle + a fill, refills are anywhere from $10-18 depending on what you get thereafter) and mellow outside on the benches for a bit. You're likely to meet some friendly locals while you consume your fresh pour.