As someone who uses Arios regularly, I can't say its terribly good but it does have its strengths. Its a very fast suit with terrible w2 on both modes. W3 on mode 1 is good, but not too great. It can make people retreat, especially when used as DPS filler. Tag with a team mate and get free shots with w3 all the time. Not every suit has I-field, and all of Arios' weapons pierce through infighter.
Plus you can MA mode and run in and out of battles. Boost down people that are brave enough to go in your team's line of fire to prevent them from escaping or use the boost down dash to escape.
爆ぜろリアル！ 弾けろシナプス！ BANISHMENT THIS WORLD!
00 Raiser, 00 7S/G, V2AB, Infinite Justice, HWS v, Master Fuunsaiki, God Fuunsaiki, SR Sazabi, Crossbone X1 Kai, X2 Kai, Harute (Final Mission Type) Stargazer, Crossbone X3, Sazabi
Upcoming projects: Arios Ascalon (100% Complete!), Crossbone X1 Skullheart (100% Complete!)
IGN - ホモゲーバスター
Ship 1 - Feoh