Yes.
Yes yes yes.
I have a White and Red Samurai/Turtle deck from "ye olden tymes" of the Kamigawa cycle.
The turtling is a result of the Soul Foundry (imprint a creature to summon more of it) + the Pristine Angel (protection from everything when untapped; surprisingly not legendary), the Red and White Myojins (Indestructible with devastating one-time use abilities) and Hondens (Heal 2 life per shrine every upkeep for White, deal one damage per shrine to any target for Red), the Kaldra equipment (too many effects to list), and Konda, Lord of Eiganjo (Indestructible, high bushido, vigilance...the list goes on).
I continually lose against my brother, who has a Black Blue Artifact deck from the Mirrodin cycle. Seriously, some of that stuff he uses is really annoying. Ever heard of the Mycosynth Lattice? The best card in the game for an Artifact user...
Mycosynth Lattice (makes everything artifact and makes it so you and the opponent can use any mana as though it were any color) + Darksteel Forge (makes all of your artifacts indestructible) = epic lose for me.
As well as Arcbound Ravager (lets you sacrifice artifacts for +1/+1 tokens on it) + Mycosynth Lattice + Summoning Station (Tap: Summon a 2/2 colorless pincher token, if an artifact leaves the battle, untap Summoning Station). If you get trample on it, it's just game over for the other guy. Unless they pull out an Awe Strike

D), which lets you absorb the next damage target creature deals as health.
Fatespinner, which forces your opponents to name a step during their upkeep which they will skip, is also extremely annoying.
And the Magus of the Unseen, who lets you take control of an opponent's artifact for a turn if you pay 1 + a blue, is
so annoying with the Mycosynth Lattice and the Arcbound Ravager. I mean, he can just build up his Urza lands (really good with the Mycosynth Lattice too, by the way), and take all of my lands, then sacrifice them.
Anyway, as for the composition of our decks: I'd say they're both somewhere between 20% and 33% mana, largely comprised of creatures, and with several (2-6) supporting spells of each type, with many artifacts thrown in. Our decks total around 60 cards each.
I also have a pre-built Zombie deck for some reason. Think it came with the special Planar Magic gamemode.