I'm a few days late to the thread, but thought I would give my 2 cents anyway
I'm a recent Majestic Gardens convert. I've stayed there twice now (I think sometime late last time and early this year). The last 11 years of going to
Disneyland and staying off property, I've been anti-anything not on Harbor before Katella, save for Stovall's and Westin. That has now changed, and MG is my go-to. (FYI: I'd never do the walk from MG to Disneyland. Yuck!)
I'll start with the shuttle. I expected it to be terrible. I expected it to never run on time, and have long waits. Conversely, it runs on a schedule that it keeps fairly well-- :00 and :30 leaving from MG, and :15 and :45 leaving from Disneyland. During high-needs times (around park opening and after fireworks), they will often run extra busses, but not always. One of my only complaints was the shuttle themselves-- one is a repurposed school-bus, and could really use a refresh. But, it got the job done in a big way; after all, it can take like 80 people at once! They also had a large shuttle (maybe 30 people size?) that had a few broken seatbacks, meaning you kind of had to hold yourself up. But it's a short ride, so not a huge deal. The smaller shuttle (around 22 people maybe) was great when it wasn't a busy time. And as a solo traveler, they'd often just put me in the front seat, occasionally letting me "skip the line" because I was the only one not in a group.
Price: look at Priceline. I can usually get a room for $140-ish, which is often $60-80 less per day than going direct.
The grounds were generally great. I loved the castle look! Well kept overall. My only issue was that on my first trip I was in the "Garden" building and they have pet-rooms apparently somewhere near that... and so at 6am, people's dogs were relieving themselves right outside my exit door. Dog poo smell isn't my ideal way to start the day, even from a chihuahua. However, the second time I was in the main building, so it wasn't an issue. My first time they were also doing some outside renovations, so I had to hop around a portion of sidewalk without any concrete. But for that price, easy peasy! I haven't used the pool, but looked over it, and it looked nice. There's a restaurant in the main building, but I never ate there. They also have a small convenience store; I'd grab my morning water there since it was a little less $$$ than inside the parks.
The rooms. I've done two different rooms (the second one was definitely a 1 king room; the first one I think was a 2 queen). The first one, like I said earlier, was in the Garden Tower on floor 1. The room was HUGE. Like double the room size as most basic 2 Queen rooms. The longest wall in each room had a forest-type photo mural so it felt like it wasn't a basic white hotel room. The furniture in the room was classic and in good repair. Plenty of storage area. The king room had a couch in it, so I had a spot to enjoy some treats after the parks were closed. Floors were carpeted but passed my "white sock test." Bathrooms were fairly regular-sized, but perfectly reasonable. Vanity area outside the bathroom so that you could have someone getting ready out there while someone was showering. The king room also had a small bench right inside the front door so you could walk in and take shoes right off (my preference). My second room was in the main building. It felt like it took forever to get to my room, but it was all indoors, which was great.
Let me know if you have any other questions about MG!