Nux++, easy is boring.
The same applies for the flamer, a really boring weapon that does all the work for you.
On another note, stage 3 is still horribly boring as well.
They effectively remove any use of the non-stage3 classes/weapons since you wont stand a chance against stage 3 opponents if you roll with the lower stages. (Well, except for maybe one basi on your team only acting as a booster)
The most boring class is definitely the rant, being massive in it's size everything can hit it, and it can hit everything too. On the human side of boring we got the chainsuit. Facing a couple of chainsuits the only class you can go with is a rant, since the massive knockback they generate is enough to push back any other alien out of attack range.
Compare this to stage 1 and 2 where you can see a big variety of aliens and humans fighting. Stage 3 really limits your choices, and unfortunately those classes are rather boring and requires way less skill than stage 1 and 2.
In short, stage 1 and 2: Dancing with the enemy, using a big variety of weapons or classes with every class/weapon being good in a specific situation.
Stage 3: Humans using either the chainsuit with lots of life and a weapon requiring a lot less aiming or the luci, and the aliens with the rants mauling everything and getting shot by everything.
(Yes - this is nothing new for MGDev, and was as boring in 1.1 too)
Some random ideas (I know this wont happen, but it complements the post):
¤ The chainsuit focuses on speed rather than health and a steady chaingun. For example it could give more stamina for +button6, or just be slightly faster in general.
¤ The rant removed and replaced with a class the size of the goon, but faster and/or stronger attacks with some unique feature. (Actually, it could have something like the rants maul, be smaller and have less health)
If anything, it could be tested and reverted back if it sucked.