In my opinion, some folks (not necessarily any of y'all, but in general) need to use more right foot and more revs before dismissing a car as "underpowered". If you're accelerating with 50% throttle and 4000rpm and you don't feel it's enough, that's not a real excuse to blame the car. You're not maximizing the potential of the vehicle.

Now, if you're at full throttle, redlining the car multiple times, and still begging for power, then a bigger motor may be in order.

I do a lot of one-lane passing on VA backroads, and I manage to complete most passes. In those cases, it's usually a 90-140 km/h pass, and with a mere 2.5 litre 184hp engine, I find the X3 acceptable most of the time (of course, it's always full throttle, redline in 3rd). Sure, a Merc SL55 would pass with more swagger, but hey, I managed the pass, right?