the su-76 has pretty much always been a good rush vehicle against static infantry heavy play. now it's good against vehicles too. they didn't remove any of the core weakness though, it still dies easily and is usually a waste against moving infantry. i think the only real question there is about it now is whether or not it comes a bit too early/too fast.
This is pretty much sums up the Su-76. Its a spammable glass canon for the sov, its not broken unit and its also not a worthless one. The timings of when units should come out is still relatively new so it won't be perfect right now and is probably the only thing that needs to be changed.