the whole appeal of TES as a series is that it is exactly what you make it. Mods can extend the game to infinity, but if you're like me (a dedicated console gamer) its strictly up to you to make the game last longer. I already have a different character for most of the playstyles, current toon is roleplaying a Thalmor agent who infilitrated the college of winterhold unknown to any even ancano. He's a pure mage wearing only robes which can at times be challenging but definetly makes it exciting too. Funny fact, under stats my favorite weapon is a pickaxe....not because i've killed anything with it but because i use it on iron veins to transmute to gold (AKA never used a weapon other than magic) anyways, the game really has limitless possibilities even on vanilla version, you just have to keep it interesting for you.
The problem with Skyrim is, mods can fix simplified gameplay, but they can't fix the subpar writing, dialogue, and quests.
Yes, the guilds largely svck, especially the Thieves' Guild.
Radiants are useless in terms of extending the guild's lifetime because all they do is bring in cash, not story.
Daggerfall's guilds were all Radiant! But somehow even those were more interesting than Skyrim's. Hmmph. Kind of sad that a game that's 15 years old has a more refined Radiant quest system than Skyrim
