I've been a standard-only player for about 4-5 months and only a few weeks ago I started playing taiko. The main reason I stayed away from Taiko were:
1. Didn't know it's actually popular. I wasn't aware that there's actually a big taiko (and ctb) scene and I thought those modes are not worth investing my time on.
2. The fact that there are no beginner maps for taiko was a huge problem too, made it pretty much impossible to learn it. All the taiko-specific difficulties on standard maps that I love were way too hard for me, so I felt like I have no way to get into it.
However after talking to 2 active taiko players, I looked around at the rankings are realized a lot of people play taiko (and ctb), which made me show interest in it. Then one of the taiko players I talked to told me how to search for easy taiko maps, that they go by japanese difficulty names (kantan/futsu/muzukashi) and he gave me some muzukashii maps to practice on, which helped me start learning the game.
I think taiko is very fun, although it lacks the visual appeal of standard mode for a spectator. It's still fun to play. I hope more taiko-only players played standard too, and that more standard-only players played taiko, but until somebody makes a good map list of easy maps to learn taiko with it'll be hard for people to get in.
I saw the thread somebody recently made for learning taiko, and while I think it was very nicely formatted and explained well, I tried following it and the content didn't help me that much to improve... it seemed to focus more on working on your speed, and not enough focus on D/K patterns. As a standard player, speed is much less of a problem to me, and what I really needed help with was reading red/blue in time to hit them correctly.
Just going over a ton of normal-difficulty standard maps and checking their translates to find ones that are good to practice on helped me improve more. (like Nymph's mapset for Sweets Parade [normal]. A rare good translate for taiko beginner learning! most translates end up terrible)
I think sliders and spinners don't belong in taiko mode at all, and translates shouldn't include them. They're as good as a break section in a map and this makes low-level translates pretty much "empty" for actually learning taiko. And without translates, most players have no clue how to find low level taiko maps for learning purposes. I had to literally go over all of my taiko diffs to find easier ones like the one for Last Christmas which I could do at first with HalfTime, and then helped me improve and learn to clear it normally too, etc.