I've picked up several recordings but since I only listen to Mahler once every couple of years, attention paid has probably been insufficient.
Solti [Decca] - I have heard this once and don't remember anything about it
Kondrashin [Melodiya] - Generally my favourite. Kondrashin tends to be, in general, the fastest and most neurotic Mahler conductor and therefore tends to divide opinion for that reason. (People also have a variety of opinions regarding Soviet brass.)
Bernstein [Sony] - Also pretty good; hard to go wrong with, in general
Gielen [SWR] - usually described as "modernist"; I'm not really sure what's modernist about it in all honesty. Never had a strong opinion about it
Klemperer [EMI] - Has all the usual tradeoffs of slow tempi, but I don't hate it; just usually need a break after Nachtmusik I
Haitink [RCO Live 1969] - I'm not sure I have actually listened to this
Neumann [Berlin Classics] - This is the Leipzig Gewandhaus recording. Probably the best-sounding one in my collection, at least in terms of orchestral playing. Definitely prachtvoll and, yes, somewhat impersonal. This is usually the other one I listen to most often
I'm not sure what the critical consensus is; professional critics seem to like Bernstein, Mahler anoraks lean more towards Gielen or Abbado (which I'm sure I used to have, but it doesn't appear to be in my collection anymore) etc.