OK. First, it LOOKS like he made sure the foot & the arms are hitting joists - that's good.
Second, it LOOKS like he's got it grounded - that's good - BUT it looks like the blocks are not close enough to the cable's entry point into the house - that's bad - BUT it's hard to tell what's what from one pic - even a high-res one like you posted.
Third, he left a bunch of slack instead of cutting the lines tight. Enh. No harm done, and it might come in handy some day.
Some people will argue that switches shouldn't be mounted on the mast. Others will say it doesn't matter. I say it depends on the install layout. I usually wall-mount them - makes troubleshooting easier if you don't have to keep climbing onto the roof to swap stuff around.
The little blocks on the mast are ground blocks the big one is a switch - almost certainly a DP34 - 3 satellites in, 4 tuners out - standard with a SuperDish.
Conclusion: It may not be perfect, but it IS better than a lot of them!