They do seem to be all polished and everyone loves them on release, but the games haven't held people over for a long time because Arc System always changes focus to the next thing. BlazBlue was a big deal less than a year ago and it's dying fast, Dragon Ball FighterZ was the biggest fighting game in years and now the future doesn't look too promising for it either. Guilty Gear Xrd is probably their best game currently, but it's already moved out of the spotlight.
The fighting games community moves on pretty fast from what I've seen (at my local tournament place, the most popular game was always released in the past 6 months or so, though Tekken 7 and Dragon Ball FighterZ did go longer)
BlazBlue was over in 2015, cross-tag is just a light spinoff. GG is their number one hit series and it's still extremely niche even amongst fighting games.
ASW is just a niche developer with a few one hit wonders, but even so I can see Granblue being a success in Japan and River City Girls will probably be well received by the few Beat'em up players left.
Overall ArcSys is in a pretty good place as a small japanese dev/publisher, compared to NIS, Mages and other similar companies.
Side gril is best gril