The first season of Legion Arena and here are my thoughts on this.
The matchmaking system
I think the matchmaking system is pretty bad. Around the top 30% you will get only players that have actually have two characters above level 230 and the rest are 210. I have been thinking about the matchmaking system. Take the average level of the player team and let him/her compete someone with almost the same average level.
Some classes
I have the feeling that the attack pattern of some classes are always the same. Take kanna for example. This class is always hitting the main character. Or beast tamer. They are attacking the main character for a bit, not completely killing them, and then kind of AoE the rest of them. So this arena doesn't feel random at all. What it supposed to be in my opinion.
Synergy effect
There are some synergy effects that are broken and some are not performing very well. I don't know all the synergy effects but these are need to rework on for the next legion arena. Invincible for 10 sec when an explorer is played. This one is pretty broken because 10 sec is very long and it will destroy some attack patterns of some classes. So for example if a class is attacking that specific supporter first than you basically lost the match. This one need to be lowered to 7 or 8 sec.
I don't know what you need to place for this one. The synergy is when you place ... your ally will heal 1 more. This healing is so low at classes that are doing so much damage. My suggestion up the healing a little bit.
Maybe there are more synergy effects that are broken or under performing but these things are actually standing out for me.
Legion Arena overall
I like the Legion Arena is great concept. It is something different and good way for the reboot people to get 2x coupons. So nexon, please consider a season 2 of this, but with some changes.
If you took the time to read my opinions, I would like to thank you for time.