Day one has had some issues with lag. But other than that, the game is quite enjoyable. I played it way back when it was just entering Beta phase, and the models, effects, and mechanics were nowhere near as polished as they are now. This will never be a replacement for tabletop in my book, but it's a well-voiced and well-designed story if nothing else. I haven't played with anyone else yet, mostly due to the lag issues. I'm expecting these issues will dissipate with some patching, which will likely be a couple weeks for full resolution.
I will say this - I have a decker, and he's awesome in his own right. However, it's weird that you don't need a decker to hack things. The "hacking" skill is really more of a general electronics skill. So one could reasonably make a mage with hacking and be just as good at hacking as a decker with hacking. So really it boils down to weapon type that you use.
Decks give a lot of debilitating abilities and attacks, and often don't require line of sight.
Talismans (spellcasting) can hit whole areas and unleash an absurd amount of punishment.
Guns are standbys that everyone should have at least some skill with.
Summons are pretty cute if nothing else. The only summoner I used in my game had the ability to summon this little bear that healed itself whenever it attacked, making it a pretty useful tank.
I haven't had a chance to try out the rigger consoles yet, or explore their tree.
All in all, it's never going to replace tabletop for the "true" experience, but it's a damn sight better than I would have predicted in Beta. They went through the polish phase a lot better than most games I've tested.