I don't think any TM game has ever been designed for, or is nearly as enjoyable in competitive 1v1 in comparison to playing with larger numbers of human players. In every TM title it's easy to exploit an overly defensive and cheap playstyle, whether it be playing hit and run, overstocking your inventory/regenerating your AA and health before initiating an encounter, or abusing the advantages certain vehicles have in isolated confrontations, while they may be balanced in matches with a larger number of players.
I can primarily commentate on TM 2012, since I have decent experience playing 1v1s in that game, though I maintain that 1v1s aren't a true indicator of a player's skill. However, they're definitely fun if you cut out all of the defensive bullcrap. The general rules the experienced community plays by is no health pickups, no cooked remotes (some totally ban remotes, I think they're balanced if free-aimed and used like detnoballs primarily for their staggering effect), no non-standard vehicles (i.e. no Talon, Jugg, or flying Sweet Bot), and to play aggressive in general. This basically means spending minimal time doing weapon routes, and just gathering weapons on the way to meet your opponent and picking them up as the battle shifts through the map, trying to constantly be engaged in fighting your opponent.
Even though the heavier vehicles are generally considered most dominant in TM 2012, 1v1s do give lightweights more opportunity since they aren't disadvantaged by health attrition or excessive pressure like they can be in larger lobbies. A good Crimson Fury can dominate a heavy like Darkside simply with its maneuverability against Darkside's slow turning radius, and even if the Darkside has an inventory full of homing missiles it would struggle even positioning itself to get its reticle locked on. However, there are still some dominant vehicles in 1v1. Shadow is dominant in larger lobbies, and it is also very dominant in 1v1s since it's so well rounded.
However, some vehicles that are mid-tier in team environments are definitely upper-tier in 1v1s. Vermin is the best flanking vehicle in the game, and against only one other opponent it gives Shadow a run for its money as the best 1v1 vehicle. As a general rule, the more open the map is, the better a Vermin does since it can dodge the vast majority of weapons without having to give up armour or the effectiveness/regeneration of its special weapon. There's a person who played Vermin who was pretty mediocre in team matches, but played 1v1 with Vermin solely on Killosseum and was basically unbeatable by virtue of that vehicle and map combination. A lot of the vehicles with decent maneuverability and special regeneration like Death Warrant, Outlaw and Roadkill do well too. The slower mid-weights like Meat Wagon and Roadboat tend to be unfavorable in a lot of scenarios, and while heavies like Junkyard Dog and Sweet Tooth are good against most match-ups, they're especially unfavorable against Shadow or Vermin.
Luis wrote on 03/10/15 at 16:32:37:
To have a good 1vs1 match you will have to play without abusing that weapon. But that doesn't change the fact that the weapon is there. Especially since there are people who love abusing that weapon. So TMPS3 is kicked out for having a weapon like that. That leaves TM2 and TMB.
Not really, all you have to do is agree not to use it. People are decent enough and the good players don't use it in 1v1 by default. If someone needs to rely on remotes to do well in 1v1, they're basically irrelevant anyways.
Shalashaska wrote on 03/10/15 at 17:58:48:
Is the game more balanced without the patches?
You can't play online without the patches. You can play split-screen or LAN games, but it's more unbalanced when unpatched since Shadow's special was even more powerful pre-patch, and some of its closest competitors such as Vermin, Death Warrant and Roadkill were weaker.