Mark X is a good car but considering that you find 325i E90 is gutless, then I'd think you'd feel similar about Mark X. Well it is after all just another normal sedan so cannot expect much oomph from it, but it's a very reliable car with still decent performance to easily outrun the typical Camry/Accord/Mazda 6/Teana/Passat plus good FC too (if in good condition). The good one is actually the first gen version (2004-2009 GRX120) which was slightly more powerful and lighter than the newer model (GRX130)....
Mark X? Never check that one before, which model will it be ?