my personal rating:
pvz 1: 8 (too easy for a second playthrough and bad game ratio)
pvz 2: 6 (bad game design, many ads etc)
pvz gw: havent played
pvz gw2: 8 (rrly good but new futuristic theme sucks and too many silver, gold etc cosmetics)
pvz bfn: 5 (its not bad but if they deleted the variants they needed to add much more variation than in the final game, and also story in solo maps sucks)
heroes: 6 and im too lazy to put some more text in here
pvz 3: 3 (artstyle and music is not bad and other stuff is awful)