This year was quite ropey. We went to Paradiski for the 1st week in April. Some of the skiing was OK, a couple of bits very thin. Went for a day to 3V. Skied from Courchevel 1300 to Orelle and back. Had to down-lift to 1300 at the end of the day (predictable), but Meribel was shocking and a bike would have been appropriate.
IMO spring 2011 was exceptionally bad and I’d gamble on most places being OK for skiing – we’ve re-booked the same place for 2nd week next April.
As for the slush, work on your technique, don’t get lazy, and don’t get tired and you should be OK. There’s no such thing as bad snow, just bad skiers…
…and don’t forget to have fun. It’s why you’re there.