Not now. Definitely not now.
They just switched to a new client which is as bad as something 'ready for the public' can be. It has massive memory leaks, meaning no matter how strong your pc, after 2-3 games MTGO will have hogged all the RAM of your pc and you will need to restart the client... not to mention some baffling UI decisions and bugs of all sorts, BIG and smalls.
Paying [a considerate] amount of money to get into MTGO now is not a good choice, in fact a lot of people have been selling all their cards and getting out.
This is basically the response of all people who don't play the client very often and are reactionary based on others analysis.
Yes, the program has a lot of memory leaks and if you don't have a powerful system you're not going to be able to run the program well. That is a problem. However, to say that no matter the strength of your computer you'll have to restart is false. The program caps out at 2gb of ram while leaking, which is ridiculous but to say that nobody's system will be able to handle that is false.
The UI is laterally terrible as compared to version three. It's equally confusing and unintuitive. Nothing new here seeing the low quality of all Wizards technological pursuits.
I use MTGO every day. Right now, singles prices are low, so buying cards is safe. Yes, the player base has dwindled but it's more of people's systems not being able to handle the client than it just being objectively bad comparatively. MTGO is still fine if you want to draft every once in a while and despite there being bugs and such, it's the best non-paper representation of the game that you can play. I'm not saying that there aren't problems with the client but to say that MTGO is only negatives is to take away from the fact that you still get to play Magic.