Let's Play Legend of Grimrock 2 #47: An Obvious Arena is no less Perilous
There are two types of arena encounters in dungeon crawlers: surprise arenas and telegraphed arenas. The former forces you to deal with it in whatever condition your party stumbles upon it, often forcing a reload which can cost you a fair amount of time. They are best used sparingly and for out-of-the-way optional content which rewards you well for completing it.
The latter is seen a lot more often and while it sometimes hides away extra goodies, they're usually used as a way to see if your party is strong enough to move on to later points of the game. Failure means you need to grow stronger by gaining a few levels of better equipment, though that's only possible if experience and money are infinite.
So far I think Grimrock 2 has done much better than the first entry in the series when it comes to arenas, but there's still plenty more game left. Fingers crossed it maintains this trend.
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