I have only been to the Arlington Skatium once and found it to be nice. I miss the old Big Wheel Skate that was torn down a few years ago. When you went to Big Wheel on Friday night, you knew you would bump into all the cool kids and the staff were all college kids who played awesome music and tried hard to learn your name.
The Arlington Skatium is just that. A huge Run of the Mill Skatium. When I went, there was mostly little kids and their parents skating. It is a large rink and was quite clean. I would highly reccommend it as a place to throw a Birthday Party :)
During the Weeknights, local Hockey Groups use the rink as a place to practice and to compete against other teams.
One nice thing about the skatium is they have both the regular roller skates and Speed Skates available to rent. Last time I was there, you were allowed to bring and use your own Rollerblades, but only if they had not been used on pavement.