Theres nothing wrong with it, its ur opinion and no one elses, the lvl is fine and suits the need for the demo. Its deathmatch so of course ur not gonna be completely satisfied with the game until u play all gamemodes and lvls. As a whole the game is good and has potential to be better so long as the ppl who play it enjoy it and play it properly, u cannot possibly judge this game yet, and stop trying to convince others.
If others like it, it can't be all bad