Many computer based recording systems fail because there is too much other stuff going on in the background, software and hardware wise.
Most people who report success with PC based set-ups have nothing running on the puter but the OS, the hardware drivers and a decent recording software program. This means no anti virus, no games and no Internet. Just a good sound-card and the software to make it run.
Even still, many feel less then enthralled with mixing with a mouse and wading through menus to get anything done so with analog, you have a tactile, physical system to work with that doesn't crash or lose your tracks due to a power outage.
What analog wont give you is instant rewind and the ability to cut and paste parts together as easily as many digital systems so, if you need to do a lot of editing to get your parts down or like the ability of rearranging songs after they have been tracked, you might want to consider a digital Portastudio which is a bit more reliable then a PC but is still susceptible to crashes and power failure disasters.
I use analog because of two main reasons.
The sound quality is incredible with the right usage of the equipment.
And the main reason is the tactile feel of seeing all of your controls and being able to access any or all of them without wading through menus to do something.
There's something magical and inspiring about working on a big mixer, seeing all the routing in a physical sense of paths and knowing that most of the best music in the world was recorded on similar equipment.
The main thing to recording though is to have good material and good musicianship. Once you have those under your belt, you can get great results from even semi-pro gear.
Cheers!