Got about halfway through Act II solo. Been pretty cake so far. I think if you're overpowered in ATK it's actually easier to solo Hell mode than play with others because it keeps the enemy HPs low so you can 1 hit them and blow through mobs & bosses. Wheres with 2-4p they have more HP so you need to actually survive for a few mins and I'm not good at that.
I REALLY WISH you could compare equip at the AH in real time like by switching out equip. I am using a 2H sword that is 350 DPS with +16% damage and +43% critical and +STR 50% and Life Leech 2%. I thought if I replaced it with TWO 1H Swords that have ~300 DPS, +15-20% damage, +20% crit +40 STR +2% life leech it would double my stats since it's like I just equipped two of my current 2H. So I bought them for 15k and 20k on AH. Then I equip both and my DPS goes from 6100DPS to 3700DPS and I'm like wtff. So I went back to using my 2H sword.
I've had a lot of times where I by equip that looks like it has better stats, but then when I go in game and see the real-time comparison the stats are worse for some reason and I just wasted my money.
Also, I need to price my items better on the AH. I keep buying good rares on the AH for 15-30k a piece, yet I keep selling the rares I find that are EVEN BETTER than the stuff I'm buying for 5k a sale just to make sure it sells. And it does! My stuff sells in like an hour each time. But I feel like I really should be making more money on these. Hell, I've had times where my equip is better than ANYTHING ON THE ENTIRE CURRENT AH in that level range with those stats and I see the next closest ones selling for 100k-500k and then I sell them for like 10k

But I've also had stuff sit for DAYS on the AH and I hate that so I've just been pricing everything at 5k with an occasional 10k.
I have this Helmet for instance that I'm using which is like the best helmet type for the 50-56 range barbarian with Vit + 111, and STR + 55, and an empty socket (so you can add life + 12%) and some other stat like Poison resist + 25. I went and I searched the AH for helmets in the 50-56 range with Vit+100 min, and STR+50 min and socket and there wasn't a single one on the entire AH. I guess when I stop using it and move on to something else I'll price it at like 99k and see if it sells on the AH.