Pros:
Almost as prototypical as a course can get.
El Dorado has apparently been around for 44 years now - DGCR suggests there are only 110 active courses as old as this property. It certainly bears resemblance to many other 70s and 80s courses I've stopped by, with its flat park setting, present but forgiving old trees, and modest variation in gameplay. I think this is one that stands the test of time reasonably well, and continues to offer a basic, pleasant round to amateur players.
The basics/amenities are prototypical. Numbered DISCatchers, concrete tees, signs with all info and map. Taped spokes for next tees. Practice baskets. Many alternate pin positions, though signs don't indicate the active position. It is laid out in a 9 + 9 format with return to the parking halfway through your round.
The land is also pretty standard for a moderately large city park. Mostly flat, there is plenty of open space, but also some fairly large trees and bushes through which the course plays. At a few points, a gentle slope gives you a nice downhill tee shot. Other park uses (most notably a tennis court) occupy the center, and the course winds around these in its second half.
This topography, along with a uniform par-54 layout, make El Dorado very friendly. The chances to lose a disc are few and far between, the upkeep is spot-on, and a bad shot doesn't typically preclude you from keeping a decent score. You also can't really get lost, and the open layout means you'll always have other groups in sight no matter where you are.
The shot shaping and gameplay is modest but not bereft of interest. A typical hole has a smattering of trees that force you to choose a line, but are generous when it comes to execution. A decent number play down mostly-formed tunnels, but again these are wide and not butt-clenchers. Scrambling will be largely open unless you throw straight into a bush. Upper 200's through mid 300's are the standard distance. To me, this is basic design for amateurs, creating a non-punitive but slightly rewarding layout depending on your skill level.
Cons:
Few substantial knocks on a pleasant property.
A small con is that there are often several baskets in sight from a tee. Once or twice I identified the wrong one to throw towards. This would be easily solved by including pin position indicators on tee signs.
As with most of the well-established courses in this area of the country, El Dorado seems to get a lot of traffic. Weekday afternoon saw me passing three groups over the course of a round. I'd estimate more than half of the holes had someone active on them at any given point. It's not nearly as ridiculous as, say, Morley Field in San Diego, but I wouldn't count on a lightning fast round either.
In terms of limitations, El Dorado's are obvious though not severe. Every hole is a par-3, and most of them fit into a specific distance envelope as well. There isn't enough tree cover to create truly technical, shot shaping holes. Elevation is moderate on only a small number of holes. MA2 players should probably be able to save par even after bad drives.
Other Thoughts:
In case you didn't get the memo, El Dorado is a very standard course. It's no stretch to think this is a very early disc golf course upon which many later designers drew. Beginners could have a fun time, and more experienced players may enjoy a soft round. That said, I think it is woefully overrated on this site. I'm sure there are many happy memories here, and I would gladly play it any day, but there isn't anything to commend this site above any other Typical course. Give it a fling, and you'll find yourself enjoying the basic tenets of disc golf - the thrill of flight and enjoyment of nature.
~Similar Courses: Brahan Spring Park (Hunstville, AL); Frog Rock (Austell, GA); La Mirada Regional Park - Front (La Mirada, CA).