I started 5 1/2 years ago with a cool looking gun I saw used. It is a 22" 243, with the camo laminated stock. I was completely unfamiliar with these guns and immediately started an internet search to find out they were not a bad risk for the money. I ended up on the marlin forum and spent quite a lot of time there before it was shut down.
The first feature that drew me to these guns is the ambidextrous nature of a single shot - Im a left haded shooter. As a tinkerer reloader, I want to load for many different cartridges, and this was an easy way to add dies to my collection beyond the handful of offerings usually offered in bolt guns.
Next, I saw the BC as a much cheaper means to get a "old school' 45-70 compared to the sharps. I bought one of these new 4 years ago.
In the mean time, marlin shut their forum down and I somehow found everyone over here. A lot of talk took place about the accessory barrel program and I decided to add to my reloading die stack and got the 357 and 223 (I never thought it was worth the trouble to send in for just 1 barrel). I haven't loaded any for the 223 but the 357 had an added treat with this platform. These guns are really easy to so simple chamber reams and my 357 became a 357max. My next order brought a 35whelen and a 44mag (for conversion to 445sm) and the whelen was a bump in the road for me. That barrel went back to HR and they allowed a replacement so I got a 25-06. Remember my rule about 2 barrels, this was an opportunity to get a 24" 243 and sell my original 22" version.
I think this is where I stand now, 2 stocked frames, one with monte carlo and one straight, and 6 barrels. Fortunately, all my barrels will fit on both of my frames.
In answer to the question, I like these because they are cheap, easy to add barrels, easy to modify chamberings, and work for left handed shooters. I don't hunt with them, nor they are not tools. They are toys to allow me to enjoy my hobby - guns, reloading and shooting.