Well, I've finally defeated Alduin, and now that I have fulfilled my destiny there seems to be nothing else to do in all of Skyrim.
I mean, you have now completed the ultimate challenge, so wouldn't doing anything else be trivial?
I've only played for 10 hours, yet this game suggests that there are over 100 hours of gameplay.
I feel like the guild quests, side quests, and various other quests will be less enjoyable than the main quest.
Are they really worth doing?
I've deleted all of my saves, because I'm going to make a new one to do the main quest, though it will be significantly less enjoyable.
I really had way more fun waiting for this game than actually playing it. I guess Lao zi was right.

Anyway, I was wondering how the community felt about the main quest and what to do after it and if side quests are really worth doing.

Also, can someone explain what radiant story does? What kind of quests does it generate? Do they have stories?

Brb in 15.

"I've only played for 10 hours, yet this game suggests that there are over 300 hours of gameplay."

Fixed for you. Seriously look it up, the game has well over 100 hours worth packed into it. Here are some suggestions, why not join some guilds or something, or if you were playing as a good character, roll a new evil character and have fun killing people.

That's exactly why I'm doing the other stuff before the Main Quest. While you can do quest lines in any order, it just makes more sense to build up to the whole dragon-slaying thing instead of powering through it and wondering where to go from there.

Well as I asked, are the guild quests really worth doing?

Go exploring for a while, talk to some NPCs, etc. I ended up getting involved in quite a few interesting quests, and I found some great enjoyment out of them - this being after I completed the main quest.

Yeah, I guess you're right there.

Also, I would like to add that I thought the main quest had to be finished in order for me to randomly encounter dragons. During the main quest, I encountered many, however when randomly exploring, I only came across 3 or 4. I wandered for about 3 hours total, exploring a large part of Skyrim. Where can I find these dragons randomly? I know they reside by word walls, but I'm talking about randomly finding them out in the wilderness.

A lot depends on what you mean by 'worth it' and what you do when playing a game with quests. There's a lot of exploring and lore that comes from doing side quests, and you may find some interesting loot/stuff while doing so. Some quests will lead you to companions to journey with you, you may stumble across someone to marry.. you might purchase a home in a town you particularly like or find a treasure map on a bandit you stumble across in a camp on your way to some old ruin.

If you're just looking for quests to go from point a to point b and as a means of getting loot, it may not be worth it to you - as there is some randomness in the treasure you'll find in chests and on mobs.

However, those 90+ extra hours of gameplay have to come from somewhere, so I'd say they are worth it. But then in TES games it is more about the journey in the game than 'winning' by beating the main quest.