Serious Sam is, at its heart, an arcade shooter. There is something fundamentally "right" about having a chaotic, over-the-top shooter in your pocket. The game doesn't take itself seriously, and neither does mobile gaming. The goofy cutscenes and puns land much better when you're playing in a casual setting rather than sitting at a dedicated gaming rig.
Furthermore, it was overshadowed by the later Serious Sam mobile ports for Symbian (N-Gage) and early iOS. Those had better graphics and dual-stick controls. But they lacked the raw, desperate energy of the J2ME version. The N-Gage version is smoother ; the J2ME version is meaner . serious sam 2 mobile better
If you are asking if Serious Sam 2 is the best entry point for mobile gaming compared to other titles in the series: Serious Sam is, at its heart, an arcade shooter
