It's normal for me, but I don't know. I've failed to beat Crow Mother with both a Sorc and DK at level 10, but I've seen people in Chat saying they've soloed her at levels 7-8.

It happens quite often. I really wish that grouping were allowed in all those forced solo quests.

Get silver bolts from the fighter guild skill tree. Great for interrupts and knock back on undead. Its really handy as it uses stamina. In my opinion, you don't want be using all heavy and mace. Some will argue that heavy is fine but a mace uses stamina and you will be spreading yourself too thin at early levels between magicka, stamina and health. I would use a staff until you get the weapon swap and put your points into magicka. Use food to buff your health or magicka but watch out for overcharged skill if you use magicka buff.

The games designed so you can use any weapon on any build but being a jack of all trades, master of none isn't good.

It varies. Some bosses are incredibly Over-powered in their damage-outputs.[Ahem, River Edge trio in Malabal Tor needs a nice nerf-hammer] Others are more balanced.

So yeah, hard to say. It really depends on whom you are fighting, because they all have different stats and damage-outputs.

As a sorcerer who also uses a 2h weapon and plate armor, all I can say is I would have a hard time soloing any of those if that was the only thing at my disposal too.

I do use several pieces of light armor to help with magicka regen in slots less noticable, like light armor pants that look leather, a hood, belt buckle, sometimes shoulders.

However, when soloing world bosses in higher level zones, I weapon swap to my heal staff and have both pets out for damage and occasional tanking, and can then usually solo any of the solo bosses as I heal my pets.

I finally beat Spindleclutch at level 38 lol. Almost died a few times.