I hope you realize their is no universal 'state of competitive play'
The best you can say is 'the metagame in my region'
It's attitudes like that, that still see Orks as a top tier army. People say Orks aren't competitive, but 'competitive' players take almost only las/plas with melta; then get stomped by an average ork army, because they aren't ready to deal with it (then usually treat the ork player with distain, and say his winning army isn't maximinzed for the competitive level).
Personally, i'd rather save 50 points and take an AV13 predator with auto/las; then have full squads in rhino's.
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Actually; I'll average out 2 las/plas razorback teams with dual melta shooting at MEQ in 4+cover; vs. a single serpent with scatter + 10 avengers with bladestorm.
2 'back squads [using the one-shot meltas]:
melta/plas (8) - 2.2 kills
bolts (12) - 1.3 kills
or [saving/already used combi's]
melta/plas (6) - 1.7 kills
bolts (16) - 1.8 kills
1 serpent team
scatter (4) - 0.83
avengers (30) - 3.3
So even against a combat team of marines in a woods, you'll need at least a third razorback team.
This is my problem with MSU (other then people acting like KP's shouldn't be part of the game, because of this); you talk about them being good because they can split their fire and hit lots of different targets. On average though, you have to combine many squads fire into a single target to do anything worth while.