Background: I've been playing RPGs for a long time and I've been playing AD&D for years. I enjoyed both the original D&D and D&D3/3.5/Pathfinder, other than (especially) tons of other games that are not relevant for this question.
What advantages are there to choosing AD&D over D&D3? At face value I can only see:
- already knowing the rules
- going on with an old campaign
- wanting to play specific difficult-to-convert module(s)
What reasons exist beyond the above reasons I've already identified?
To me it feels like it has very complex and senseless rules, patches over patches over patches, and most of those have been cleanly fixed by D&D3. It feels like the worst of both worlds between the (relative) neatness of D&D3 and the primordial ooze which was the Original D&D.
In comparison while I feel that D&D3 has many many flaws, I cannot think of any such flaw which isn't also present in AD&D, while the opposite doesn't hold true. Despite playing it for years, I couldn't find any single feature which AD&D does better than D&D3 with the exception – which might or might not be an house or optional rule – of Clerics not being required to pre-select the spells like the Mages.
Since many people still play it, I assume there are some features that make it preferable in some situations over D&D3, and I'd like to know what they are.
Disclaimer: This is not a rant. If you think it is, then please accept that I didn't mean it to be, and I just wasn't able to convey my question clearly enough. My mistake.