Very Entertaining!
3on3 NHL Arcade is in my mind somewhat underrated, it's a very enjoyable arcade hockey game that's easy to pick up and play, with more depth and strategy than some might realize.
There is some negative points however, in order to get a full match with 6 human players you need 3 players locally on each side, and it does not allow for human controlled goalies. There is no support for roster updates, and there is also a bug where your presentation settings do not get saved forcing you to set them every time you log in to play the game (a relatively minor but noticeable annoyance).
With the bad points out of the way though I can say it's still great fun to play -- especially when you get three human controlled players on your team and take the game online. You'll find yourself amidst swings of momentum, that require you to play more physically, power ups attained through hitting can get you back in games where you are falling behind, and the ability to choose between ALL AROUND, FAST, and STRONG players lets you build a roster suited to your own play style.
For me this is an easy recommendation for hockey fans that want something a bit lighter, even years after release its still relatively easy to find online opponents.