Hey Mosquiton nice rate!
You did a good job noticing the teams weakness to Magnezone, Lucario and Toxicroak and you explained them how they were threats quite well. The Landorus-T suggestion was a good one to help deal with the three, however I don't know if losing Rotom-W is the best idea because it makes him quite weak to Tornadus-T. However Tornadus-T is hopefully going to ubers so I am going to let that slip. with Landorus-T the team is a little more offensive, which is a nice addition to the team. Losing Rotom-W for Landorus-T as I mentioned earlier makes the team weaker to Tornadus-T but also Thunderous-T. Rotom-W is probably the only Pokemon on the team atm that can help him at least a little bit against Thunderous-T and changing it for Landorus-T who is vunerable to Hidden Power [Ice] will open up a few more problems. So after suggesting a change to a team take a step back and try to find if your suggestion openend the team up to any new threats. This is super important because that is probably one of the biggest issues I see when people make rates. Also when you finish a rate try scanning over the team a few times and try and look to see if there are any smaller changes that need to be addressed. Item changed, moveset changes, etc. Like Ferrothorn for instance. You said Magnezone is a threat so running a Shed Shell on it is not a bad idea seeing as it already has Leech Seed for recovery and doesn't run Spikes meaning it won't get worn down as much by the opponent anyway. Also another thing about rating which is probably even more important than helping the team against threats is making sure the team has the "essentials." Does the team have a rapid spinner? Does it have Stealth Rock? Does it have a revenge killer? You have to make sure a team works by having these things otherwise it doesn't matter if you help a team deal with its threats it will still be bad. This team after all lacks a Choice Scarf user entirely so that should of been addressed.
Edit: I will help you with your second rate soon
Edit 2: Shurtugal got it good job shurt! :P
Edit 3: Nice job for a first rate Frochtejohgurt :P
Ok so your Tentacruel suggestion was great seeing as the team needs to be able to beat spin blockers because of Chandelure and Dragonite and you also did a good job in telling the op why he didn't really need Toxic Spikes (his team was to offensive to abuse it). Now for a lot of your other changes you mentioned a move change like putting Leech Seed on Ferrothorn and Draco Meteor on Latios. However you didn't mention where to put them, which is quite important just doing something like Draco Meteor>Thunderbolt or Leech Seed>Spikes works. You can also bold it to if you want or add colour, but avoid hard to read colours like yellow and light green! Also doing this would of made your Chandelure suggestions easier to read (Substitute>Sunny Day, Energy Ball>Solar Beam). Also you didn't try to help the team cover up threats and you said "you see no glaring weakness." I highly advise you use this in your rates http://www.smogon.com/forums/showthread.php?t=3464038
to help you identify threats to a team easier.