New players can really benefit from such a list. More joy from game before they learn how to use more specific variants. Tier 1 - good for learning how to kill opponent, Tier 2-3 - good for learning how to use Mech in more specific conditions, Tier 4+ - good when you are bored of winning 
"from such a list", yes.
"from this list", rather not...
As for Tier one, there are lots of variants which need a lot of skill in order to be used successfully.
for example, Puma C, Owens B, Bushwacker A, Ncat...
Those are all assets which stand out in their weightclass, and a skilled pilot may use them with deadly precision.
on the other hand I don't think either of this variants is rly suited for a newbie:
Puma C; this one is the best choice if you're going to hunt down mediums, or to cripple even assaults.
However, as all other Pumas, this one suffers from being an energyboat, by having heatproblems which are too much for an unexperienced player.
Additionally you have to get close, almost brawling range, in order to bring those 6MBLs to use, while the chassi itself can't take too much damage.
It's a front line support unit, not capable of pwning, but with a high damageoutput, due to it's rather "weak" armor it is most effective when NOT the main target, which requires some experince.
Owens B; Similar to the Puma C you could call this one a close range fire support unit.
From piloting it extensively myself, I can tell you, this is not a unit for a newby!
the SSRMs pack a punch, but they are not as powerfull as they used to be, and in fact if you don't have experience with that kind of weapon you'll run dry of ammo before you may kill even one enemy.
Another problem about this unit is it's agility, it's agility is it's biggest strength and and weakness at the same time.
It is hard to hit, and capable of dodging a lot of dmg while it's strong armor will absorb the damage still coming through.
In turn most people focus on taking out the legs of an Owens first, very aware of the fact that it's the most agile unit on the field.
Once you're crippled, it only takes seconds to kill you.
I could go on like this for the Bush A, but let's just say it's twin RAC5 need skill to be used effectively...
I consider myself a vet player, since I know how to stay alive while not hiding from the enemy, but I happen to be most effective in tier 2-4 assets, while I tend to die easily in a so called tier 1.
I appreciate the work one does in order to put up a ranking like this, but if it comes only from a single person it's very subjective, and very dependent on the individuals prefered playstyle.
I for myself have learned how to effectively pilot a Mech by starting as a missileboater, since if you're doing it right, and not trying to charge with lrms, you may focus most of your concentration on how to control your mech (heat, weapons, radar, movement) while observing others.
After that, direct fire long range weapons such as PPC, and Gauss are a good way to continue, the require more skill than simply fire-and-forget-LRMs, also you'll learn how to lead your shots to make them hit, and should start to use passive/active sensors.
The last step is Brawling, which requires probably most situational awareness of all playstyles, since you have to manage weapons, heat, sensors, ammo, and most of all what's going on around you, therefor it's easiest to learn when you already learned how to use most of the systems effectively.
That's what I'd advice a newb to do in order to learn the game, instead of pointing at a list which probably only works for one or a few persons.
