So I've been playing Spiral Knights for about 80 hours, quite heavily at first then a big gap and now I'm back into it since I'm playing with a friend. He just got 3-star certified and I just got 4-star certified (although I wasn't using all the 4-star stuff for this run), and we just played through to the Core. It was...underwhelming. For some reason I had built up tier 3 in my mind as super insanely challenging, but it...wasn't. Granted we didn't use a gate that had Firestorm Citadel in it, but yeah.
My general gear: Ascended Calibur, Mighty Defender, Ash Tail Cap, Dusker Coat
His gear: Striker, the 3-star fire alchemer gun (which he used almost exclusively to varying effect), Skelly helm/suit, 3-star Owlite shield
I mean sure a hit from a Lumber would take 80% of our health bar, but between hearts and caps and not getting hit we managed okay. I can only imagine how easy it'll be when I finish my conversion to proper gear (aka Barbarous Thorn Shield instead of Mighty Defender [my mistake!], shadow/piercing/elemental swords, etc.).
Do most people play Shadow Lairs and find those really hard? As it stands I don't see a huge push to make 5-star gear since I thought the lower depths would be impossible without it. I guess the final fight in an Arena could be brutal, and like I said maybe Firestorm Citadel is the tough stuff. But in general I'm just a bit let down as I thought I'd be sitting on the edge of my seat barely surviving instead of actually making it to the bottom.
Oh well, still a fun game.
The Shadow Lairs are harder than anything else you'd find in t3. By the sounds of it, you managed to avoid most of the difficult parts of t3, but even so, it's possible for a reasonably skilled 4* (or 3*, in some cases) player to complete FSC without too much trouble or CE revives (although Vanaduke is quite difficult to fight).