Both battles played smoothly for me. Load times were no different than COH, under a minute. Melee animations were a bit weird as Monk stated, but my system handled it just fine. My specs:

Processor: IntelCore 2 Quad Q9650 3.0GHz 12 MB Cache 1333MHz FSB
Power Supply: 750 Watt Multi-GPU
Graphics Processor: Dual 512MB NVIDIA GeForce 9800GT
Memory: 4GB DDR2 SDRAM 800MHZ - 2 x 2048MB
Motherboard: NVIDIA nForce 750i SLI
OS: Windows Vista Home Premium 64-bit
System Drive: 500 GB SATA 3Gb/s 7,200 16MB Cache
Dual Optical Drives: 20x Dual Layer Burner, 4x Dual Layer Blu-ray Burner
Killer K1 Gaming Network Interface Card